diff --git a/.woodpecker/backfill-test.yaml b/.woodpecker/backfill-test.yaml
new file mode 100644
index 0000000..431f4dd
--- /dev/null
+++ b/.woodpecker/backfill-test.yaml
@@ -0,0 +1,20 @@
+when:
+  - event: pull_request
+
+steps:
+  - name: test
+    image: golang:1.25
+    directory: tools/backfill
+    commands:
+      - go vet ./...
+      - go test -race ./...
+    backend_options:
+      kubernetes:
+        serviceAccountName: default
+        resources:
+          requests:
+            memory: 512Mi
+            cpu: 1
+          limits:
+            memory: 2Gi
+            cpu: 2
diff --git a/Makefile b/Makefile
index fa3600f..78c0b70 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,12 @@
-.PHONY: init plan apply format pre-commit
+.PHONY: init plan apply format pre-commit backfill
+
+# Hosts whose hardware reality is backfilled from pdbmux into NetBox. Override to
+# add/limit hosts, e.g. `make backfill BACKFILL_HOSTS="prodnxsr0001 prodnxsr0002"`.
+BACKFILL_HOSTS ?= prodnxsr0001 prodnxsr0002 prodnxsr0003 prodnxsr0004 prodnxsr0005 \
+	prodnxsr0006 prodnxsr0007 prodnxsr0008 prodnxsr0009 prodnxsr0010 prodnxsr0011 \
+	prodnxsr0012 prodnxsr0013
+PDBMUX_URL ?= https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts
+BACKFILL_OUT ?= config/au/syd1/reality
 
 VAULT_AUTH_METHOD ?= approle
 VAULT_K8S_ROLE ?= woodpecker_terraform_infra
@@ -35,3 +43,9 @@ format:
 
 pre-commit:
 	@uvx pre-commit run --all-files
+
+# Regenerate NetBox reality YAML from pdbmux. Idempotent with stable ordering,
+# so re-running against unchanged facts leaves a clean git diff. Needs network
+# reachability to pdbmux (its HTTPS gateway is reachable from CI/workstations).
+backfill:
+	@go -C tools/backfill run . --url "$(PDBMUX_URL)" --out "$(CURDIR)/$(BACKFILL_OUT)" $(BACKFILL_HOSTS)
diff --git a/README.md b/README.md
index 293d72f..e63df39 100644
--- a/README.md
+++ b/README.md
@@ -14,10 +14,11 @@ intent and lets discovery/PuppetDB fill hardware reality.
 config/<region>/<dc>/subnets/<name>.yaml    # one file per subnet (prefix + DHCP scope)
 config/<region>/<dc>/networks/<name>.yaml   # logical networks devices join
 config/<region>/<dc>/devices/<host>.yaml    # one file per device (intent only)
+config/<region>/<dc>/reality/<host>.yaml    # one file per device (generated reality)
 config/<region>/<dc>/managed-ips.yaml       # extra manually-managed IPs
 environments/<region>/<dc>/terragrunt.hcl   # one Terragrunt env per region/dc
 modules/infra/                              # the module
-ci/puppetdb_backfill.py                     # reality backfill generator (local/in-cluster)
+tools/backfill/                             # pdbmux -> reality YAML generator (Go)
 ```
 
 `make plan` / `make apply` reconcile the YAML against NetBox + Kea. State lives in
@@ -78,13 +79,37 @@ Mapping: `netbox_device` (+ `netbox_manufacturer`/`netbox_device_type`/
 so bootapi can key the PXE boot on MAC until the discovery image exists — remove it
 once discovery/backfill populates the real NICs.
 
-## PuppetDB reality backfill
+## Reality backfill (`reality/<host>.yaml`)
 
-`ci/puppetdb_backfill.py` sweeps already-provisioned hosts and emits their hardware
-reality (serial/model/UUID + every interface's MAC/IPs, incl. overlay/loopback
-addresses Cobbler lacks) as reviewable YAML — the NetBox *reality* side, not the
-intent above. PuppetDB needs no auth but is **not reachable from CI**; run it
-in-cluster/from puppet infra. Wiring its output into NetBox is a follow-up (issue).
+`tools/backfill` (Go) queries **pdbmux** — the PuppetDB multiplexer at
+`https://pdbmux.k8s.syd1.au.unkin.net`, which merges the old (Consul) and new
+(k8s) PuppetDBs and needs no auth — for already-provisioned hosts and emits their
+hardware reality as reviewable per-host YAML:
+
+- **identity** — serial, model, UUID (from `dmi.product`);
+- **interfaces** — every recordable NIC with MAC + CIDR IPs, including the
+  overlay/loopback/kube-lb addresses Cobbler never had. Real NICs are always
+  kept; virtual interfaces are kept only when they carry a routable address,
+  which drops ephemeral Calico veths and `lo` while keeping `flannel.1`,
+  `kube-lb0`, `loopback*`. Interface names are taken from Facter, never assumed;
+- **inventory** — CPU model/count, total RAM bytes, and physical disks (Ceph RBD
+  and other virtual block devices are skipped).
+
+```sh
+make backfill                                   # all 13 existing physicals
+make backfill BACKFILL_HOSTS="prodnxsr0001"     # a subset
+```
+
+Output is deterministic and idempotent (stable ordering, sorted lists), so
+re-running against unchanged facts leaves a clean diff. Unlike raw PuppetDB,
+pdbmux's HTTPS gateway is reachable from CI/workstations. The generator only
+writes committed config; `netbox_device_interface`/`netbox_mac_address`/
+`netbox_ip_address`/`netbox_inventory_item` (plus device `serial`) reconcile it
+into NetBox on the next apply. NetBox stays authoritative for IP data.
+
+Reality is wired into NetBox only for hosts that also have an intent
+`devices/<host>.yaml`; the 13 existing physicals get their intent seeded
+separately, so until then their `reality/*.yaml` is committed but inert.
 
 ## Providers
 
diff --git a/ci/puppetdb_backfill.py b/ci/puppetdb_backfill.py
deleted file mode 100755
index f67e9d0..0000000
--- a/ci/puppetdb_backfill.py
+++ /dev/null
@@ -1,114 +0,0 @@
-#!/usr/bin/env python3
-"""Backfill NetBox device *reality* from PuppetDB for already-provisioned hosts.
-
-This emits the hardware-owned facts a running host reports (serial, model, UUID,
-and every interface's name/MAC/IPs including the overlay/loopback addresses
-Cobbler never had) as reviewable per-host YAML. It targets the *reality* side of
-NetBox (interfaces + inventory) for the ~13 existing physicals; it is NOT the
-intent `config/.../devices/*.yaml` (a human writes those).
-
-PuppetDB needs no auth (TLS terminates at the gateway; upstream is plain HTTP).
-It is NOT reachable from CI, so run this in-cluster or from puppet infra:
-
-  ./puppetdb_backfill.py --out ../reality \
-      --url http://puppetdb.puppet.svc.cluster.local:8080/pdb/query/v4/facts \
-      prodnxsr0001 prodnxsr0002 ...
-
-Fact paths follow Facter conventions (networking.*, dmi.*); verify against a live
-factset (`GET /pdb/query/v4/factsets`) before trusting output on a new estate.
-"""
-import argparse
-import json
-import os
-import sys
-import urllib.parse
-import urllib.request
-
-DEFAULT_URL = "http://puppetdb.puppet.svc.cluster.local:8080/pdb/query/v4/facts"
-
-
-def query_facts(url, certname):
-    ast = json.dumps(["=", "certname", certname])
-    full = url + "?" + urllib.parse.urlencode({"query": ast})
-    with urllib.request.urlopen(full, timeout=30) as resp:
-        rows = json.load(resp)
-    return {row["name"]: row["value"] for row in rows}
-
-
-def device_reality(certname, facts):
-    networking = facts.get("networking", {}) or {}
-    ifaces = networking.get("interfaces", {}) or {}
-    dmi = facts.get("dmi", {}) or {}
-    product = dmi.get("product", {}) or {}
-
-    interfaces = []
-    for name, data in sorted(ifaces.items()):
-        if name == "lo":
-            continue
-        ips = []
-        for b in (data.get("bindings", []) or []):
-            if b.get("address"):
-                ips.append(b["address"])
-        if data.get("ip") and data["ip"] not in ips:
-            ips.append(data["ip"])
-        interfaces.append({
-            "name": name,
-            "mac": data.get("mac"),
-            "ips": ips,
-        })
-
-    return {
-        "device": certname.split(".")[0],
-        "serial": product.get("serial_number") or facts.get("serialnumber"),
-        "model": product.get("name") or facts.get("productname"),
-        "uuid": product.get("uuid") or facts.get("uuid"),
-        "interfaces": interfaces,
-    }
-
-
-def to_yaml(d):
-    # tiny dependency-free YAML emitter for this fixed shape
-    out = [
-        f"device: {d['device']}",
-        f"serial: {d['serial'] or ''}",
-        f"model: {d['model'] or ''}",
-        f"uuid: {d['uuid'] or ''}",
-        "interfaces:",
-    ]
-    for i in d["interfaces"]:
-        out.append(f"  - name: {i['name']}")
-        out.append(f"    mac: {i['mac'] or ''}")
-        out.append("    ips: [%s]" % ", ".join(i["ips"]))
-    return "\n".join(out) + "\n"
-
-
-def main():
-    ap = argparse.ArgumentParser(description=__doc__)
-    ap.add_argument("hosts", nargs="+", help="certnames or short hostnames")
-    ap.add_argument("--url", default=os.environ.get("PUPPETDB_URL", DEFAULT_URL))
-    ap.add_argument("--out", help="write <host>.yaml here instead of stdout")
-    args = ap.parse_args()
-
-    for host in args.hosts:
-        certname = host if "." in host else f"{host}.main.unkin.net"
-        try:
-            facts = query_facts(args.url, certname)
-        except Exception as e:  # noqa: BLE001
-            print(f"# {certname}: query failed: {e}", file=sys.stderr)
-            continue
-        if not facts:
-            print(f"# {certname}: no facts (not in PuppetDB)", file=sys.stderr)
-            continue
-        text = to_yaml(device_reality(certname, facts))
-        if args.out:
-            os.makedirs(args.out, exist_ok=True)
-            path = os.path.join(args.out, f"{certname.split('.')[0]}.yaml")
-            with open(path, "w") as fh:
-                fh.write(text)
-            print(f"wrote {path}", file=sys.stderr)
-        else:
-            print(text)
-
-
-if __name__ == "__main__":
-    main()
diff --git a/config/au/syd1/reality/prodnxsr0001.yaml b/config/au/syd1/reality/prodnxsr0001.yaml
new file mode 100644
index 0000000..164d567
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0001.yaml
@@ -0,0 +1,73 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0001.main.unkin.net
+device: "prodnxsr0001"
+serial: "4RW6QM2"
+model: "OptiPlex 3050"
+uuid: "4c4c4544-0052-5710-8036-b4c04f514d32"
+interfaces:
+  - name: "enp2s0"
+    mac: "d8:9e:f3:75:c3:60"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.1/24"
+      - "198.18.19.1/32"
+  - name: "enp3s0"
+    mac: "00:ac:d0:00:00:50"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.1/32"
+      - "198.18.21.1/24"
+  - name: "flannel.1"
+    mac: "56:ac:21:3e:cd:9b"
+    mtu: 1450
+    physical: false
+    ips:
+      - "10.42.0.0/32"
+  - name: "kube-lb0"
+    mac: "1e:4f:62:0c:e8:e1"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.199.0/32"
+      - "198.18.200.0/32"
+      - "198.18.200.1/32"
+      - "198.18.200.2/32"
+      - "198.18.200.3/32"
+      - "198.18.200.4/32"
+      - "198.18.200.5/32"
+      - "198.18.200.9/32"
+  - name: "loopback0"
+    mac: "f2:3d:ef:64:42:51"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.1/32"
+  - name: "loopback1"
+    mac: "aa:36:f9:d5:f0:1d"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.1/32"
+  - name: "loopback2"
+    mac: "96:aa:ea:a3:6d:c5"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.1/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz"
+    cores: 4
+    count: 4
+  memory_bytes: 33260900352
+  disks:
+    - name: "nvme0n1"
+      model: "IM2P33F8-256GD1"
+      serial: "2M3029AD7KFE"
+      size_bytes: 256060514304
+    - name: "sda"
+      model: "SSDSC2BX012T4N"
+      serial: "BTHC651303WB1P2OGN"
+      size_bytes: 1200243695616
diff --git a/config/au/syd1/reality/prodnxsr0002.yaml b/config/au/syd1/reality/prodnxsr0002.yaml
new file mode 100644
index 0000000..eeda70f
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0002.yaml
@@ -0,0 +1,73 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0002.main.unkin.net
+device: "prodnxsr0002"
+serial: "4TC5QM2"
+model: "OptiPlex 3050"
+uuid: "4c4c4544-0054-4310-8035-b4c04f514d32"
+interfaces:
+  - name: "enp2s0"
+    mac: "d8:9e:f3:74:b6:08"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.2/24"
+      - "198.18.19.2/32"
+  - name: "enp3s0"
+    mac: "00:e0:4c:68:08:43"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.2/32"
+      - "198.18.21.2/24"
+  - name: "flannel.1"
+    mac: "02:af:20:b3:b1:5e"
+    mtu: 1450
+    physical: false
+    ips:
+      - "10.42.1.0/32"
+  - name: "kube-lb0"
+    mac: "6e:0e:5f:ed:80:48"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.199.0/32"
+      - "198.18.200.0/32"
+      - "198.18.200.1/32"
+      - "198.18.200.2/32"
+      - "198.18.200.3/32"
+      - "198.18.200.4/32"
+      - "198.18.200.5/32"
+      - "198.18.200.9/32"
+  - name: "loopback0"
+    mac: "36:7a:28:ec:2a:66"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.2/32"
+  - name: "loopback1"
+    mac: "82:3e:3b:b2:ea:14"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.2/32"
+  - name: "loopback2"
+    mac: "42:e0:d5:e8:c1:72"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.2/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz"
+    cores: 4
+    count: 4
+  memory_bytes: 33261576192
+  disks:
+    - name: "nvme0n1"
+      model: "SAMSUNG MZVL2256HCHQ-00BL7"
+      serial: "S64MNF0RB00821"
+      size_bytes: 256060514304
+    - name: "sda"
+      model: "SSDSC2BX012T4N"
+      serial: "BTHC65100A5W1P2OGN"
+      size_bytes: 1200243695616
diff --git a/config/au/syd1/reality/prodnxsr0003.yaml b/config/au/syd1/reality/prodnxsr0003.yaml
new file mode 100644
index 0000000..dfa6b5d
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0003.yaml
@@ -0,0 +1,73 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0003.main.unkin.net
+device: "prodnxsr0003"
+serial: "1PN9BS2"
+model: "OptiPlex 3050"
+uuid: "4c4c4544-0050-4e10-8039-b1c04f425332"
+interfaces:
+  - name: "enp2s0"
+    mac: "b8:85:84:a3:25:c5"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.3/24"
+      - "198.18.19.3/32"
+  - name: "enp3s0"
+    mac: "00:e0:4c:68:07:82"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.3/32"
+      - "198.18.21.3/24"
+  - name: "flannel.1"
+    mac: "6a:66:4f:b8:fb:f5"
+    mtu: 1450
+    physical: false
+    ips:
+      - "10.42.2.0/32"
+  - name: "kube-lb0"
+    mac: "3e:4c:cd:3c:33:ec"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.199.0/32"
+      - "198.18.200.0/32"
+      - "198.18.200.1/32"
+      - "198.18.200.2/32"
+      - "198.18.200.3/32"
+      - "198.18.200.4/32"
+      - "198.18.200.5/32"
+      - "198.18.200.9/32"
+  - name: "loopback0"
+    mac: "6a:a4:6f:c2:29:6e"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.3/32"
+  - name: "loopback1"
+    mac: "4e:4a:46:75:4e:5a"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.3/32"
+  - name: "loopback2"
+    mac: "be:1d:95:db:e1:ef"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.3/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz"
+    cores: 4
+    count: 4
+  memory_bytes: 33261572096
+  disks:
+    - name: "nvme0n1"
+      model: "WDC PC SN520 SDAPNUW-512G-1006"
+      serial: "191342472105"
+      size_bytes: 512110190592
+    - name: "sda"
+      model: "SSDSC2BX012T4N"
+      serial: "BTHC65100A7R1P2OGN"
+      size_bytes: 1200243695616
diff --git a/config/au/syd1/reality/prodnxsr0004.yaml b/config/au/syd1/reality/prodnxsr0004.yaml
new file mode 100644
index 0000000..1634de6
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0004.yaml
@@ -0,0 +1,75 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0004.main.unkin.net
+device: "prodnxsr0004"
+serial: "4RMYPM2"
+model: "OptiPlex 3050"
+uuid: "4c4c4544-0052-4d10-8059-b4c04f504d32"
+interfaces:
+  - name: "enp2s0"
+    mac: "d8:9e:f3:75:d5:00"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.4/24"
+      - "198.18.19.4/32"
+  - name: "enp3s0"
+    mac: "00:ac:d0:00:00:43"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.4/32"
+      - "198.18.21.4/24"
+  - name: "flannel.1"
+    mac: "b6:c2:ee:87:d6:1b"
+    mtu: 1450
+    physical: false
+    ips:
+      - "10.42.4.0/32"
+  - name: "kube-lb0"
+    mac: "6e:ae:97:31:4c:56"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.199.0/32"
+      - "198.18.200.0/32"
+      - "198.18.200.1/32"
+      - "198.18.200.2/32"
+      - "198.18.200.3/32"
+      - "198.18.200.4/32"
+      - "198.18.200.5/32"
+      - "198.18.200.6/32"
+      - "198.18.200.8/32"
+      - "198.18.200.9/32"
+  - name: "loopback0"
+    mac: "32:4f:54:04:f8:da"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.4/32"
+  - name: "loopback1"
+    mac: "56:da:d9:21:48:5f"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.4/32"
+  - name: "loopback2"
+    mac: "72:7e:58:5b:1e:d6"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.4/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz"
+    cores: 4
+    count: 4
+  memory_bytes: 33261576192
+  disks:
+    - name: "nvme0n1"
+      model: "SAMSUNG MZVLQ256HBJD-00BH1"
+      serial: "S672NX0T347235"
+      size_bytes: 256060514304
+    - name: "sda"
+      model: "SSDSC2BX012T4N"
+      serial: "BTHC65100A8G1P2OGN"
+      size_bytes: 1200243695616
diff --git a/config/au/syd1/reality/prodnxsr0005.yaml b/config/au/syd1/reality/prodnxsr0005.yaml
new file mode 100644
index 0000000..f2c895b
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0005.yaml
@@ -0,0 +1,74 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0005.main.unkin.net
+device: "prodnxsr0005"
+serial: "5TQW8T2"
+model: "OptiPlex 3060"
+uuid: "4c4c4544-0054-5110-8057-b5c04f385432"
+interfaces:
+  - name: "enp1s0"
+    mac: "54:bf:64:a0:08:64"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.5/24"
+      - "198.18.19.5/32"
+  - name: "enp3s0"
+    mac: "00:e0:4c:68:07:79"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.5/32"
+      - "198.18.21.5/24"
+  - name: "flannel.1"
+    mac: "02:2e:f5:c7:79:05"
+    mtu: 1450
+    physical: false
+    ips:
+      - "10.42.3.0/32"
+  - name: "kube-lb0"
+    mac: "6a:78:43:e0:84:b2"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.199.0/32"
+      - "198.18.200.0/32"
+      - "198.18.200.1/32"
+      - "198.18.200.2/32"
+      - "198.18.200.3/32"
+      - "198.18.200.4/32"
+      - "198.18.200.5/32"
+      - "198.18.200.7/32"
+      - "198.18.200.9/32"
+  - name: "loopback0"
+    mac: "fa:85:3b:4d:33:9f"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.5/32"
+  - name: "loopback1"
+    mac: "aa:cc:25:07:24:11"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.5/32"
+  - name: "loopback2"
+    mac: "fa:d6:a7:27:3c:e6"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.5/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i5-8400T CPU @ 1.70GHz"
+    cores: 6
+    count: 6
+  memory_bytes: 33197555712
+  disks:
+    - name: "nvme0n1"
+      model: "SAMSUNG MZVLQ256HBJD-00BH1"
+      serial: "S672NS2T518945"
+      size_bytes: 256060514304
+    - name: "sda"
+      model: "SSDSC2BX012T4N"
+      serial: "BTHC65100A891P2OGN"
+      size_bytes: 1200243695616
diff --git a/config/au/syd1/reality/prodnxsr0006.yaml b/config/au/syd1/reality/prodnxsr0006.yaml
new file mode 100644
index 0000000..285bd6e
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0006.yaml
@@ -0,0 +1,76 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0006.main.unkin.net
+device: "prodnxsr0006"
+serial: "4RWYPM2"
+model: "OptiPlex 3050"
+uuid: "4c4c4544-0052-5710-8059-b4c04f504d32"
+interfaces:
+  - name: "enp2s0"
+    mac: "d8:9e:f3:75:10:8d"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.6/24"
+      - "198.18.19.6/32"
+  - name: "enp3s0"
+    mac: "00:ac:d0:00:00:53"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.6/32"
+      - "198.18.21.6/24"
+  - name: "flannel.1"
+    mac: "86:9e:22:f3:f2:9f"
+    mtu: 1450
+    physical: false
+    ips:
+      - "10.42.7.0/32"
+  - name: "kube-lb0"
+    mac: "5a:60:5a:b8:61:3b"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.199.0/32"
+      - "198.18.200.0/32"
+      - "198.18.200.1/32"
+      - "198.18.200.2/32"
+      - "198.18.200.3/32"
+      - "198.18.200.4/32"
+      - "198.18.200.5/32"
+      - "198.18.200.6/32"
+      - "198.18.200.7/32"
+      - "198.18.200.8/32"
+      - "198.18.200.9/32"
+  - name: "loopback0"
+    mac: "36:79:13:ec:24:be"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.6/32"
+  - name: "loopback1"
+    mac: "4e:da:32:4f:1a:5b"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.6/32"
+  - name: "loopback2"
+    mac: "5e:7d:66:a9:50:74"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.6/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz"
+    cores: 4
+    count: 4
+  memory_bytes: 33261568000
+  disks:
+    - name: "nvme0n1"
+      model: "KINGSTON SKC3000S1024G"
+      serial: "50026B7687513575"
+      size_bytes: 1024209543168
+    - name: "sda"
+      model: "SSDSC2BX012T4N"
+      serial: "BTHC65100A771P2OGN"
+      size_bytes: 1200243695616
diff --git a/config/au/syd1/reality/prodnxsr0007.yaml b/config/au/syd1/reality/prodnxsr0007.yaml
new file mode 100644
index 0000000..f353c08
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0007.yaml
@@ -0,0 +1,76 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0007.main.unkin.net
+device: "prodnxsr0007"
+serial: "4SH4QM2"
+model: "OptiPlex 3050"
+uuid: "4c4c4544-0053-4810-8034-b4c04f514d32"
+interfaces:
+  - name: "enp2s0"
+    mac: "d8:9e:f3:74:b4:27"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.7/24"
+      - "198.18.19.7/32"
+  - name: "enp3s0"
+    mac: "00:ac:d0:00:00:5b"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.7/32"
+      - "198.18.21.7/24"
+  - name: "flannel.1"
+    mac: "12:a8:e5:df:a8:11"
+    mtu: 1450
+    physical: false
+    ips:
+      - "10.42.5.0/32"
+  - name: "kube-lb0"
+    mac: "56:f2:92:e9:e3:ff"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.199.0/32"
+      - "198.18.199.53/32"
+      - "198.18.200.0/32"
+      - "198.18.200.1/32"
+      - "198.18.200.2/32"
+      - "198.18.200.3/32"
+      - "198.18.200.4/32"
+      - "198.18.200.5/32"
+      - "198.18.200.6/32"
+      - "198.18.200.7/32"
+      - "198.18.200.9/32"
+  - name: "loopback0"
+    mac: "9e:d4:1e:4f:77:78"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.7/32"
+  - name: "loopback1"
+    mac: "de:7c:95:3a:84:7d"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.7/32"
+  - name: "loopback2"
+    mac: "96:5c:4a:57:6b:3b"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.7/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz"
+    cores: 4
+    count: 4
+  memory_bytes: 33261572096
+  disks:
+    - name: "nvme0n1"
+      model: "SAMSUNG MZVLQ256HBJD-00BH1"
+      serial: "S672NS2T521338"
+      size_bytes: 256060514304
+    - name: "sda"
+      model: "SSDSC2BX012T4N"
+      serial: "BTHC651407V41P2OGN"
+      size_bytes: 1200243695616
diff --git a/config/au/syd1/reality/prodnxsr0008.yaml b/config/au/syd1/reality/prodnxsr0008.yaml
new file mode 100644
index 0000000..0b4b946
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0008.yaml
@@ -0,0 +1,73 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0008.main.unkin.net
+device: "prodnxsr0008"
+serial: "4T34QM2"
+model: "OptiPlex 3050"
+uuid: "4c4c4544-0054-3310-8034-b4c04f514d32"
+interfaces:
+  - name: "enp2s0"
+    mac: "d8:9e:f3:75:06:18"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.8/24"
+      - "198.18.19.8/32"
+  - name: "enp3s0"
+    mac: "00:e0:4c:68:08:4b"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.8/32"
+      - "198.18.21.8/24"
+  - name: "flannel.1"
+    mac: "0e:58:18:dc:77:da"
+    mtu: 1450
+    physical: false
+    ips:
+      - "10.42.6.0/32"
+  - name: "kube-lb0"
+    mac: "e6:48:68:86:a6:70"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.199.0/32"
+      - "198.18.200.0/32"
+      - "198.18.200.1/32"
+      - "198.18.200.2/32"
+      - "198.18.200.3/32"
+      - "198.18.200.4/32"
+      - "198.18.200.5/32"
+      - "198.18.200.9/32"
+  - name: "loopback0"
+    mac: "26:6f:96:df:29:58"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.8/32"
+  - name: "loopback1"
+    mac: "2e:30:dc:43:e6:c4"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.8/32"
+  - name: "loopback2"
+    mac: "de:ee:01:46:10:4b"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.8/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz"
+    cores: 4
+    count: 4
+  memory_bytes: 33261576192
+  disks:
+    - name: "nvme0n1"
+      model: "SAMSUNG MZVLW256HEHP-000H7"
+      serial: "S365NX0K803338"
+      size_bytes: 256060514304
+    - name: "sda"
+      model: "INTEL SSDSC2BX01"
+      serial: "BTHC635301YE1P2OGN"
+      size_bytes: 1200243695616
diff --git a/config/au/syd1/reality/prodnxsr0009.yaml b/config/au/syd1/reality/prodnxsr0009.yaml
new file mode 100644
index 0000000..ee277c7
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0009.yaml
@@ -0,0 +1,80 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0009.main.unkin.net
+device: "prodnxsr0009"
+serial: "DXN4X63"
+model: "OptiPlex 7080"
+uuid: "4c4c4544-0058-4e10-8034-c4c04f583633"
+interfaces:
+  - name: "brcom1"
+    mac: "00:16:3e:05:2d:0a"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.9/32"
+      - "198.18.25.254/24"
+      - "fd42:b65e:b59e:de1c::1/64"
+  - name: "brdmz1"
+    mac: "00:16:3e:8d:17:aa"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.9/32"
+      - "198.18.24.14/28"
+  - name: "brwan1"
+    mac: "00:16:3e:49:18:62"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.20.14/28"
+      - "fd42:f06c:628:43ae::1/64"
+  - name: "enp2s0"
+    mac: "70:b5:e8:38:e9:8d"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.9/24"
+      - "198.18.19.9/32"
+  - name: "enp3s0"
+    mac: "00:e0:4c:68:0f:5d"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.9/32"
+      - "198.18.21.9/24"
+  - name: "loopback0"
+    mac: "72:b5:e6:93:78:08"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.9/32"
+  - name: "loopback1"
+    mac: "ea:0d:ae:2d:36:82"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.9/32"
+  - name: "loopback2"
+    mac: "ce:a4:8a:c5:cb:0e"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.9/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz"
+    cores: 8
+    count: 16
+  memory_bytes: 66850242560
+  disks:
+    - name: "nvme0n1"
+      model: "KINGSTON SNV3S500G"
+      serial: "50026B72835F70DC"
+      size_bytes: 500107862016
+    - name: "nvme1n1"
+      model: "KINGSTON SKC3000S1024G"
+      serial: "50026B7686FC8586"
+      size_bytes: 1024209543168
+    - name: "sda"
+      model: "INTEL SSDSC2BX01"
+      serial: "BTHC712010Q91P6PGN"
+      size_bytes: 1600321314816
diff --git a/config/au/syd1/reality/prodnxsr0010.yaml b/config/au/syd1/reality/prodnxsr0010.yaml
new file mode 100644
index 0000000..1968438
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0010.yaml
@@ -0,0 +1,80 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0010.main.unkin.net
+device: "prodnxsr0010"
+serial: "DXL3X63"
+model: "OptiPlex 7080"
+uuid: "4c4c4544-0058-4c10-8033-c4c04f583633"
+interfaces:
+  - name: "brcom1"
+    mac: "00:16:3e:48:7a:41"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.10/32"
+      - "198.18.26.254/24"
+      - "fd42:d01f:2449:bc96::1/64"
+  - name: "brdmz1"
+    mac: "00:16:3e:9d:d5:d1"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.10/32"
+      - "198.18.24.30/28"
+  - name: "brwan1"
+    mac: "00:16:3e:82:39:bd"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.20.30/28"
+      - "fd42:d67b:303f:6e24::1/64"
+  - name: "enp2s0"
+    mac: "70:b5:e8:38:e9:37"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.10/24"
+      - "198.18.19.10/32"
+  - name: "enp3s0"
+    mac: "00:e0:4c:68:0f:de"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.10/32"
+      - "198.18.21.10/24"
+  - name: "loopback0"
+    mac: "12:66:f8:64:7f:6d"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.10/32"
+  - name: "loopback1"
+    mac: "9e:1c:e1:f0:df:2b"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.10/32"
+  - name: "loopback2"
+    mac: "8e:96:81:e6:60:f3"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.10/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz"
+    cores: 8
+    count: 16
+  memory_bytes: 66850258944
+  disks:
+    - name: "nvme0n1"
+      model: "KINGSTON SKC3000S1024G"
+      serial: "50026B7686FC8568"
+      size_bytes: 1024209543168
+    - name: "nvme1n1"
+      model: "KINGSTON SNV3S500G"
+      serial: "50026B72835F709B"
+      size_bytes: 500107862016
+    - name: "sda"
+      model: "INTEL SSDSC2BX01"
+      serial: "BTHC71200Y391P6PGN"
+      size_bytes: 1600321314816
diff --git a/config/au/syd1/reality/prodnxsr0011.yaml b/config/au/syd1/reality/prodnxsr0011.yaml
new file mode 100644
index 0000000..a43a438
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0011.yaml
@@ -0,0 +1,80 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0011.main.unkin.net
+device: "prodnxsr0011"
+serial: "DXL7X63"
+model: "OptiPlex 7080"
+uuid: "4c4c4544-0058-4c10-8037-c4c04f583633"
+interfaces:
+  - name: "brcom1"
+    mac: "00:16:3e:f5:75:19"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.11/32"
+      - "198.18.27.254/24"
+      - "fd42:8521:2898:632d::1/64"
+  - name: "brdmz1"
+    mac: "00:16:3e:51:57:10"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.11/32"
+      - "198.18.24.46/28"
+  - name: "brwan1"
+    mac: "00:16:3e:89:a5:81"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.20.46/28"
+      - "fd42:2822:1126:7d77::1/64"
+  - name: "enp2s0"
+    mac: "70:b5:e8:38:e9:0f"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.11/24"
+      - "198.18.19.11/32"
+  - name: "enp3s0"
+    mac: "00:e0:4c:68:0f:55"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.11/32"
+      - "198.18.21.11/24"
+  - name: "loopback0"
+    mac: "4a:e7:7c:fa:c4:08"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.11/32"
+  - name: "loopback1"
+    mac: "8e:00:c7:54:02:55"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.11/32"
+  - name: "loopback2"
+    mac: "4a:0a:b8:df:08:52"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.11/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz"
+    cores: 8
+    count: 16
+  memory_bytes: 66850238464
+  disks:
+    - name: "nvme0n1"
+      model: "KINGSTON SNV3S500G"
+      serial: "50026B72835F70FA"
+      size_bytes: 500107862016
+    - name: "nvme1n1"
+      model: "KINGSTON SKC3000S1024G"
+      serial: "50026B7686FC855C"
+      size_bytes: 1024209543168
+    - name: "sda"
+      model: "INTEL SSDSC2BX01"
+      serial: "BTHC712010EL1P6PGN"
+      size_bytes: 1600321314816
diff --git a/config/au/syd1/reality/prodnxsr0012.yaml b/config/au/syd1/reality/prodnxsr0012.yaml
new file mode 100644
index 0000000..a85deac
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0012.yaml
@@ -0,0 +1,80 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0012.main.unkin.net
+device: "prodnxsr0012"
+serial: "G0W0TC3"
+model: "OptiPlex 7080"
+uuid: "4c4c4544-0030-5710-8030-c7c04f544333"
+interfaces:
+  - name: "brcom1"
+    mac: "00:16:3e:a6:72:58"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.12/32"
+      - "198.18.28.254/24"
+      - "fd42:b712:24e:9015::1/64"
+  - name: "brdmz1"
+    mac: "00:16:3e:0c:d4:5b"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.12/32"
+      - "198.18.24.62/28"
+  - name: "brwan1"
+    mac: "00:16:3e:66:a9:2d"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.20.62/28"
+      - "fd42:c419:fbd5:1220::1/64"
+  - name: "enp2s0"
+    mac: "70:b5:e8:4f:05:1e"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.12/24"
+      - "198.18.19.12/32"
+  - name: "enp3s0"
+    mac: "00:e0:4c:68:0f:e5"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.12/32"
+      - "198.18.21.12/24"
+  - name: "loopback0"
+    mac: "32:11:8f:a0:3a:d7"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.12/32"
+  - name: "loopback1"
+    mac: "12:d2:9c:88:ea:58"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.12/32"
+  - name: "loopback2"
+    mac: "ca:f7:1c:b4:90:b3"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.12/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz"
+    cores: 8
+    count: 16
+  memory_bytes: 66850258944
+  disks:
+    - name: "nvme0n1"
+      model: "KINGSTON SNV3S500G"
+      serial: "50026B72835F70AE"
+      size_bytes: 500107862016
+    - name: "nvme1n1"
+      model: "KINGSTON SKC3000S1024G"
+      serial: "50026B7686FC855A"
+      size_bytes: 1024209543168
+    - name: "sda"
+      model: "INTEL SSDSC2BX01"
+      serial: "BTHC712010TL1P6PGN"
+      size_bytes: 1600321314816
diff --git a/config/au/syd1/reality/prodnxsr0013.yaml b/config/au/syd1/reality/prodnxsr0013.yaml
new file mode 100644
index 0000000..956a62d
--- /dev/null
+++ b/config/au/syd1/reality/prodnxsr0013.yaml
@@ -0,0 +1,80 @@
+# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts certname=prodnxsr0013.main.unkin.net
+device: "prodnxsr0013"
+serial: "H0W0TC3"
+model: "OptiPlex 7080"
+uuid: "4c4c4544-0030-5710-8030-c8c04f544333"
+interfaces:
+  - name: "brcom1"
+    mac: "00:16:3e:7a:fd:76"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.13/32"
+      - "198.18.29.254/24"
+      - "fd42:5b9:111b:8e6f::1/64"
+  - name: "brdmz1"
+    mac: "00:16:3e:47:0c:64"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.13/32"
+      - "198.18.24.78/28"
+  - name: "brwan1"
+    mac: "00:16:3e:e9:7a:12"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.20.78/28"
+      - "fd42:1492:b7fd:fced::1/64"
+  - name: "enp2s0"
+    mac: "70:b5:e8:4f:04:b0"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.13/24"
+      - "198.18.19.13/32"
+  - name: "enp3s0"
+    mac: "00:e0:4c:68:0f:36"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.19.13/32"
+      - "198.18.21.13/24"
+  - name: "loopback0"
+    mac: "0a:f5:e7:20:2e:5c"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.19.13/32"
+  - name: "loopback1"
+    mac: "22:87:17:9e:32:db"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.22.13/32"
+  - name: "loopback2"
+    mac: "b6:87:cc:0e:4e:83"
+    mtu: 1500
+    physical: false
+    ips:
+      - "198.18.23.13/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz"
+    cores: 8
+    count: 16
+  memory_bytes: 66850271232
+  disks:
+    - name: "nvme0n1"
+      model: "KINGSTON SNV3S500G"
+      serial: "50026B72835F70C5"
+      size_bytes: 500107862016
+    - name: "nvme1n1"
+      model: "KINGSTON SKC3000S1024G"
+      serial: "50026B7686FC8569"
+      size_bytes: 1024209543168
+    - name: "sda"
+      model: "INTEL SSDSC2BX01"
+      serial: "BTHC712010691P6PGN"
+      size_bytes: 1600321314816
diff --git a/environments/au/syd1/terragrunt.hcl b/environments/au/syd1/terragrunt.hcl
index 9977bd2..3eab38c 100644
--- a/environments/au/syd1/terragrunt.hcl
+++ b/environments/au/syd1/terragrunt.hcl
@@ -29,6 +29,12 @@ locals {
 
   managed_ips_file = "${local.cfg_dir}/managed-ips.yaml"
   managed_ips      = fileexists(local.managed_ips_file) ? yamldecode(file(local.managed_ips_file)) : []
+
+  reality_files = fileset(local.cfg_dir, "reality/*.yaml")
+  reality = {
+    for f in local.reality_files :
+    trimsuffix(basename(f), ".yaml") => yamldecode(file("${local.cfg_dir}/${f}"))
+  }
 }
 
 terraform {
@@ -40,4 +46,5 @@ inputs = {
   networks    = local.networks
   devices     = local.devices
   managed_ips = local.managed_ips
+  reality     = local.reality
 }
diff --git a/modules/infra/devices.tf b/modules/infra/devices.tf
index 8b6ade0..9f7bef6 100644
--- a/modules/infra/devices.tf
+++ b/modules/infra/devices.tf
@@ -54,6 +54,9 @@ resource "netbox_device" "this" {
   role_id        = netbox_device_role.this[each.value.role].id
   site_id        = tonumber(data.netbox_site.this[each.value.site].id)
   status         = each.value.pxe ? "staged" : "active"
+
+  # Serial is hardware reality; take it from the backfill when present.
+  serial = try(var.reality[each.key].serial, null)
 }
 
 # Transitional: bootapi keys PXE on MAC and no discovery image exists yet, so seed a
diff --git a/modules/infra/reality.tf b/modules/infra/reality.tf
new file mode 100644
index 0000000..db732b9
--- /dev/null
+++ b/modules/infra/reality.tf
@@ -0,0 +1,100 @@
+locals {
+  # Reality is wired only for hosts that also carry an intent device (the 13
+  # existing physicals get their intent seeded in issue #2). Until then a host's
+  # reality/*.yaml is reviewed and committed but produces no NetBox resources.
+  reality_devices = { for k, r in var.reality : k => r if contains(keys(var.devices), k) }
+
+  # "<device>:<iface>" -> real interface. Names come from Facter, never assumed.
+  reality_interfaces = merge([
+    for dname, r in local.reality_devices : {
+      for i in coalesce(r.interfaces, []) : "${dname}:${i.name}" => {
+        device   = dname
+        name     = i.name
+        mac      = i.mac
+        mtu      = i.mtu
+        physical = coalesce(i.physical, false)
+      }
+    }
+  ]...)
+
+  reality_macs = { for k, i in local.reality_interfaces : k => i if i.mac != null && i.mac != "" }
+
+  # "<device>:<iface>:<ip>" -> address on that interface (CIDR form).
+  reality_ips = merge([
+    for dname, r in local.reality_devices : {
+      for pair in flatten([
+        for i in coalesce(r.interfaces, []) : [
+          for ip in coalesce(i.ips, []) : { device = dname, iface = i.name, ip = ip }
+        ]
+      ]) : "${pair.device}:${pair.iface}:${pair.ip}" => pair
+    }
+  ]...)
+
+  # "<device>:<key>" -> one NetBox inventory item (CPU, memory, per-disk).
+  reality_inventory = merge([
+    for dname, r in local.reality_devices : {
+      for item in concat(
+        try(r.inventory.cpu, null) == null ? [] : [{
+          key         = "cpu"
+          name        = "CPU"
+          description = trimspace(format("%s x%d", try(r.inventory.cpu.model, ""), try(r.inventory.cpu.count, 0)))
+          part_id     = try(r.inventory.cpu.model, null)
+          serial      = null
+        }],
+        try(r.inventory.memory_bytes, null) == null ? [] : [{
+          key         = "memory"
+          name        = "Memory"
+          description = format("%d bytes", r.inventory.memory_bytes)
+          part_id     = null
+          serial      = null
+        }],
+        [for d in try(r.inventory.disks, []) : {
+          key         = "disk-${d.name}"
+          name        = "Disk ${d.name}"
+          description = trimspace(format("%s %d bytes", try(d.model, ""), try(d.size_bytes, 0)))
+          part_id     = try(d.model, null)
+          serial      = try(d.serial, null)
+        }]
+      ) : "${dname}:${item.key}" => merge(item, { device = dname })
+    }
+  ]...)
+}
+
+# Real NICs and virtual interfaces (overlay/loopback/kube-lb) the host reports.
+resource "netbox_device_interface" "reality" {
+  for_each = local.reality_interfaces
+
+  device_id = netbox_device.this[each.value.device].id
+  name      = each.value.name
+  type      = each.value.physical ? "1000base-t" : "virtual"
+  mtu       = each.value.mtu
+}
+
+resource "netbox_mac_address" "reality" {
+  for_each = local.reality_macs
+
+  mac_address         = each.value.mac
+  device_interface_id = netbox_device_interface.reality[each.key].id
+}
+
+# NetBox stays IP-authoritative; these record the addresses (incl. overlay /
+# loopback / kube-lb VIPs) a running host actually carries.
+resource "netbox_ip_address" "reality" {
+  for_each = local.reality_ips
+
+  ip_address          = each.value.ip
+  status              = "active"
+  description         = each.value.device
+  device_interface_id = netbox_device_interface.reality["${each.value.device}:${each.value.iface}"].id
+}
+
+resource "netbox_inventory_item" "reality" {
+  for_each = local.reality_inventory
+
+  device_id   = netbox_device.this[each.value.device].id
+  name        = each.value.name
+  description = each.value.description
+  part_id     = each.value.part_id
+  serial      = each.value.serial
+  discovered  = true
+}
diff --git a/modules/infra/variables.tf b/modules/infra/variables.tf
index b6099cf..2f8b587 100644
--- a/modules/infra/variables.tf
+++ b/modules/infra/variables.tf
@@ -66,6 +66,46 @@ variable "managed_ips" {
   default = []
 }
 
+variable "reality" {
+  description = <<-EOT
+    Per-host hardware reality keyed by device name, generated from pdbmux by
+    tools/backfill (see `make backfill`) — never hand-authored. It carries the
+    facts NetBox cannot learn from intent: serial/model/UUID, every recordable
+    interface (real NICs plus overlay/loopback/kube-lb) with MAC and CIDR IPs,
+    and CPU/RAM/disk inventory. Reality is wired into NetBox only for hosts that
+    also have an intent `devices/<host>.yaml`; until that intent lands, a host's
+    reality sits reviewed-but-inert.
+  EOT
+  type = map(object({
+    device = optional(string)
+    serial = optional(string)
+    model  = optional(string)
+    uuid   = optional(string)
+    interfaces = optional(list(object({
+      name     = string
+      mac      = optional(string)
+      mtu      = optional(number)
+      physical = optional(bool, false)
+      ips      = optional(list(string), [])
+    })), [])
+    inventory = optional(object({
+      cpu = optional(object({
+        model = optional(string)
+        cores = optional(number)
+        count = optional(number)
+      }))
+      memory_bytes = optional(number)
+      disks = optional(list(object({
+        name       = string
+        model      = optional(string)
+        serial     = optional(string)
+        size_bytes = optional(number)
+      })), [])
+    }))
+  }))
+  default = {}
+}
+
 variable "vault_address" {
   description = "Vault server address for the token data source."
   type        = string
diff --git a/tools/backfill/emit.go b/tools/backfill/emit.go
new file mode 100644
index 0000000..59e1eef
--- /dev/null
+++ b/tools/backfill/emit.go
@@ -0,0 +1,108 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+// emitYAML renders a Reality as deterministic, yamllint-clean YAML consumed by
+// modules/infra (variable "reality"). Field order is fixed and every list is
+// pre-sorted upstream, so re-running the generator against unchanged facts
+// produces byte-identical output (clean diffs).
+func emitYAML(r Reality, source string) string {
+	var b strings.Builder
+	b.WriteString("# Generated by tools/backfill from pdbmux - do not edit by hand.\n")
+	b.WriteString("# " + source + "\n")
+
+	line(&b, 0, "device", q(r.Device))
+	if r.Serial != "" {
+		line(&b, 0, "serial", q(r.Serial))
+	}
+	if r.Model != "" {
+		line(&b, 0, "model", q(r.Model))
+	}
+	if r.UUID != "" {
+		line(&b, 0, "uuid", q(r.UUID))
+	}
+
+	if len(r.Interfaces) == 0 {
+		b.WriteString("interfaces: []\n")
+	} else {
+		b.WriteString("interfaces:\n")
+		for _, i := range r.Interfaces {
+			b.WriteString("  - name: " + q(i.Name) + "\n")
+			if i.MAC != "" {
+				line(&b, 4, "mac", q(i.MAC))
+			}
+			if i.MTU > 0 {
+				line(&b, 4, "mtu", fmt.Sprintf("%d", i.MTU))
+			}
+			line(&b, 4, "physical", fmt.Sprintf("%t", i.Physical))
+			if len(i.IPs) == 0 {
+				line(&b, 4, "ips", "[]")
+			} else {
+				b.WriteString("    ips:\n")
+				for _, ip := range i.IPs {
+					b.WriteString("      - " + q(ip) + "\n")
+				}
+			}
+		}
+	}
+
+	if r.Inventory != nil {
+		emitInventory(&b, r.Inventory)
+	}
+	return b.String()
+}
+
+func emitInventory(b *strings.Builder, inv *Inventory) {
+	b.WriteString("inventory:\n")
+	if inv.CPU != nil {
+		b.WriteString("  cpu:\n")
+		if inv.CPU.Model != "" {
+			line(b, 4, "model", q(inv.CPU.Model))
+		}
+		if inv.CPU.Cores > 0 {
+			line(b, 4, "cores", fmt.Sprintf("%d", inv.CPU.Cores))
+		}
+		if inv.CPU.Count > 0 {
+			line(b, 4, "count", fmt.Sprintf("%d", inv.CPU.Count))
+		}
+	}
+	if inv.MemoryBytes > 0 {
+		line(b, 2, "memory_bytes", fmt.Sprintf("%d", inv.MemoryBytes))
+	}
+	if len(inv.Disks) == 0 {
+		line(b, 2, "disks", "[]")
+	} else {
+		b.WriteString("  disks:\n")
+		for _, d := range inv.Disks {
+			b.WriteString("    - name: " + q(d.Name) + "\n")
+			if d.Model != "" {
+				line(b, 6, "model", q(d.Model))
+			}
+			if d.Serial != "" {
+				line(b, 6, "serial", q(d.Serial))
+			}
+			if d.SizeBytes > 0 {
+				line(b, 6, "size_bytes", fmt.Sprintf("%d", d.SizeBytes))
+			}
+		}
+	}
+}
+
+func line(b *strings.Builder, indent int, key, val string) {
+	b.WriteString(strings.Repeat(" ", indent))
+	b.WriteString(key)
+	b.WriteString(": ")
+	b.WriteString(val)
+	b.WriteByte('\n')
+}
+
+// q double-quotes a scalar so values with ':' (MACs), '@'/'(' (CPU models) or
+// '/' (serials, CIDRs) round-trip through yamldecode unambiguously.
+func q(s string) string {
+	s = strings.ReplaceAll(s, `\`, `\\`)
+	s = strings.ReplaceAll(s, `"`, `\"`)
+	return `"` + s + `"`
+}
diff --git a/tools/backfill/emit_test.go b/tools/backfill/emit_test.go
new file mode 100644
index 0000000..68a8b72
--- /dev/null
+++ b/tools/backfill/emit_test.go
@@ -0,0 +1,79 @@
+package main
+
+import "testing"
+
+func sampleReality() Reality {
+	return Reality{
+		Device: "prodnxsr0001",
+		Serial: "4RW6QM2",
+		Model:  "OptiPlex 3050",
+		UUID:   "4c4c4544-0052-5710-8036-b4c04f514d32",
+		Interfaces: []Interface{
+			{Name: "enp2s0", MAC: "d8:9e:f3:75:c3:60", MTU: 1500, Physical: true,
+				IPs: []string{"198.18.15.1/24", "198.18.19.1/32"}},
+			{Name: "loopback0", MAC: "f2:3d:ef:64:42:51", Physical: false,
+				IPs: []string{"198.18.19.1/32"}},
+		},
+		Inventory: &Inventory{
+			CPU:         &CPU{Model: "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz", Cores: 4, Count: 4},
+			MemoryBytes: 33260900352,
+			Disks: []Disk{
+				{Name: "sda", Model: "SSDSC2BX012T4N", Serial: "BTHC651303WB1P2OGN", SizeBytes: 1200243695616},
+			},
+		},
+	}
+}
+
+const wantYAML = `# Generated by tools/backfill from pdbmux - do not edit by hand.
+# source: URL certname=prodnxsr0001.main.unkin.net
+device: "prodnxsr0001"
+serial: "4RW6QM2"
+model: "OptiPlex 3050"
+uuid: "4c4c4544-0052-5710-8036-b4c04f514d32"
+interfaces:
+  - name: "enp2s0"
+    mac: "d8:9e:f3:75:c3:60"
+    mtu: 1500
+    physical: true
+    ips:
+      - "198.18.15.1/24"
+      - "198.18.19.1/32"
+  - name: "loopback0"
+    mac: "f2:3d:ef:64:42:51"
+    physical: false
+    ips:
+      - "198.18.19.1/32"
+inventory:
+  cpu:
+    model: "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz"
+    cores: 4
+    count: 4
+  memory_bytes: 33260900352
+  disks:
+    - name: "sda"
+      model: "SSDSC2BX012T4N"
+      serial: "BTHC651303WB1P2OGN"
+      size_bytes: 1200243695616
+`
+
+func TestEmitYAMLGolden(t *testing.T) {
+	got := emitYAML(sampleReality(), "source: URL certname=prodnxsr0001.main.unkin.net")
+	if got != wantYAML {
+		t.Errorf("emit mismatch:\n--- got ---\n%s\n--- want ---\n%s", got, wantYAML)
+	}
+}
+
+func TestEmitYAMLDeterministic(t *testing.T) {
+	src := "source: URL certname=x"
+	if emitYAML(sampleReality(), src) != emitYAML(sampleReality(), src) {
+		t.Error("emit is not deterministic")
+	}
+}
+
+func TestEmitYAMLEmptyCollections(t *testing.T) {
+	got := emitYAML(Reality{Device: "d"}, "s")
+	want := "# Generated by tools/backfill from pdbmux - do not edit by hand.\n# s\ndevice: \"d\"\ninterfaces: []\n"
+	if got != want {
+		t.Errorf("empty emit = %q, want %q", got, want)
+	}
+}
diff --git a/tools/backfill/go.mod b/tools/backfill/go.mod
new file mode 100644
index 0000000..b7b1f9f
--- /dev/null
+++ b/tools/backfill/go.mod
@@ -0,0 +1,3 @@
+module git.unkin.net/unkin/terraform-infra/tools/backfill
+
+go 1.25
diff --git a/tools/backfill/main.go b/tools/backfill/main.go
new file mode 100644
index 0000000..c060472
--- /dev/null
+++ b/tools/backfill/main.go
@@ -0,0 +1,81 @@
+// Command backfill queries pdbmux (the PuppetDB multiplexer) for already-
+// provisioned hosts and emits their hardware reality — serial, model, UUID,
+// every recordable interface's MAC/IPs (including overlay/loopback/kube-lb
+// addresses) and CPU/RAM/disk inventory — as reviewable per-host YAML for the
+// NetBox reality side (modules/infra variable "reality").
+//
+// It is a generator, not a live data source: it writes committed config that
+// terraform later reconciles into NetBox. Intent (config/.../devices/*.yaml)
+// stays human-authored; this fills reality only.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const (
+	defaultURL    = "https://pdbmux.k8s.syd1.au.unkin.net/pdb/query/v4/facts"
+	defaultDomain = "main.unkin.net"
+)
+
+func main() {
+	url := flag.String("url", envOr("PDBMUX_URL", defaultURL), "pdbmux PuppetDB v4 facts endpoint")
+	out := flag.String("out", "", "directory to write <host>.yaml into (default: stdout)")
+	domain := flag.String("domain", defaultDomain, "domain appended to short hostnames to form certnames")
+	flag.Parse()
+
+	hosts := flag.Args()
+	if len(hosts) == 0 {
+		fmt.Fprintln(os.Stderr, "usage: backfill [--url URL] [--out DIR] [--domain D] host...")
+		os.Exit(2)
+	}
+
+	client := newFactsClient(*url)
+	rc := 0
+	for _, h := range hosts {
+		certname := h
+		if !strings.Contains(h, ".") {
+			certname = h + "." + *domain
+		}
+		facts, err := client.facts(certname)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "%s: query failed: %v\n", certname, err)
+			rc = 1
+			continue
+		}
+		if len(facts) == 0 {
+			fmt.Fprintf(os.Stderr, "%s: no facts (not in pdbmux)\n", certname)
+			continue
+		}
+
+		text := emitYAML(factsToReality(certname, facts), fmt.Sprintf("source: %s certname=%s", *url, certname))
+		if *out == "" {
+			fmt.Print(text)
+			continue
+		}
+		if err := os.MkdirAll(*out, 0o755); err != nil {
+			fmt.Fprintf(os.Stderr, "%s: %v\n", certname, err)
+			rc = 1
+			continue
+		}
+		path := filepath.Join(*out, shortName(certname)+".yaml")
+		if err := os.WriteFile(path, []byte(text), 0o644); err != nil {
+			fmt.Fprintf(os.Stderr, "%s: %v\n", certname, err)
+			rc = 1
+			continue
+		}
+		fmt.Fprintf(os.Stderr, "wrote %s\n", path)
+	}
+	os.Exit(rc)
+}
+
+func envOr(key, def string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return def
+}
diff --git a/tools/backfill/pdbmux.go b/tools/backfill/pdbmux.go
new file mode 100644
index 0000000..c246563
--- /dev/null
+++ b/tools/backfill/pdbmux.go
@@ -0,0 +1,61 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"time"
+)
+
+// factRecord is one PuppetDB v4 /facts row as served by pdbmux.
+type factRecord struct {
+	Certname string          `json:"certname"`
+	Name     string          `json:"name"`
+	Value    json.RawMessage `json:"value"`
+}
+
+// factsClient queries a pdbmux (PuppetDB v4) facts endpoint. pdbmux merges the
+// old (Consul) and new (k8s) PuppetDBs and needs no auth, so a plain GET with a
+// certname AST query is all that is required.
+type factsClient struct {
+	url    string
+	client *http.Client
+}
+
+func newFactsClient(factsURL string) *factsClient {
+	return &factsClient{url: factsURL, client: &http.Client{Timeout: 30 * time.Second}}
+}
+
+// facts returns the certname's facts as a name->value map. A node pdbmux does
+// not know about yields an empty map and a nil error.
+func (c *factsClient) facts(certname string) (map[string]json.RawMessage, error) {
+	q, _ := json.Marshal([]any{"=", "certname", certname})
+	params := url.Values{}
+	params.Set("query", string(q))
+
+	resp, err := c.client.Get(c.url + "?" + params.Encode())
+	if err != nil {
+		return nil, err
+	}
+	defer func() { _ = resp.Body.Close() }()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("HTTP %d: %s", resp.StatusCode, string(body))
+	}
+
+	var rows []factRecord
+	if err := json.Unmarshal(body, &rows); err != nil {
+		return nil, fmt.Errorf("decode facts: %w", err)
+	}
+	out := make(map[string]json.RawMessage, len(rows))
+	for _, r := range rows {
+		out[r.Name] = r.Value
+	}
+	return out, nil
+}
diff --git a/tools/backfill/pdbmux_test.go b/tools/backfill/pdbmux_test.go
new file mode 100644
index 0000000..4c2f283
--- /dev/null
+++ b/tools/backfill/pdbmux_test.go
@@ -0,0 +1,62 @@
+package main
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestFactsClientParsesResponse(t *testing.T) {
+	var gotQuery string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		gotQuery = r.URL.Query().Get("query")
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`[
+			{"certname":"h.main.unkin.net","name":"dmi","value":{"product":{"name":"OptiPlex 3060","serial_number":"S1","uuid":"U1"}},"environment":"production"},
+			{"certname":"h.main.unkin.net","name":"uuid","value":"U1","environment":"production"}
+		]`))
+	}))
+	defer srv.Close()
+
+	facts, err := newFactsClient(srv.URL).facts("h.main.unkin.net")
+	if err != nil {
+		t.Fatalf("facts: %v", err)
+	}
+	if gotQuery != `["=","certname","h.main.unkin.net"]` {
+		t.Errorf("query = %s", gotQuery)
+	}
+	if _, ok := facts["dmi"]; !ok {
+		t.Errorf("dmi fact missing: %v", facts)
+	}
+
+	r := factsToReality("h.main.unkin.net", facts)
+	if r.Model != "OptiPlex 3060" || r.Serial != "S1" {
+		t.Errorf("reality = %+v", r)
+	}
+}
+
+func TestFactsClientEmptyForUnknownNode(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		_, _ = w.Write([]byte(`[]`))
+	}))
+	defer srv.Close()
+
+	facts, err := newFactsClient(srv.URL).facts("nope")
+	if err != nil {
+		t.Fatalf("facts: %v", err)
+	}
+	if len(facts) != 0 {
+		t.Errorf("expected empty facts, got %v", facts)
+	}
+}
+
+func TestFactsClientErrorsOnNon200(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		http.Error(w, "all backends failed", http.StatusBadGateway)
+	}))
+	defer srv.Close()
+
+	if _, err := newFactsClient(srv.URL).facts("h"); err == nil {
+		t.Fatal("expected error on 502")
+	}
+}
diff --git a/tools/backfill/reality.go b/tools/backfill/reality.go
new file mode 100644
index 0000000..2260125
--- /dev/null
+++ b/tools/backfill/reality.go
@@ -0,0 +1,271 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+	"sort"
+	"strings"
+)
+
+// placeholderMAC is the constant MAC the kernel assigns to Calico veths; it is
+// never a real hardware address and must not be recorded.
+const placeholderMAC = "ee:ee:ee:ee:ee:ee"
+
+// virtualDiskPrefixes are block-device name prefixes that are not physical
+// disks (Ceph RBD volumes, loop/device-mapper/optical/ram devices). They come
+// and go with workloads, so recording them would make the backfill non-idempotent.
+var virtualDiskPrefixes = []string{"rbd", "loop", "dm-", "md", "sr", "zram", "ram", "fd", "nbd", "zd", "dasd"}
+
+// Interface is one NIC's recorded reality.
+type Interface struct {
+	Name     string
+	MAC      string
+	MTU      int
+	Physical bool
+	IPs      []string // CIDR form, e.g. 198.18.15.1/24
+}
+
+// CPU, Disk and Inventory carry the hardware inventory NetBox never learns from
+// intent.
+type CPU struct {
+	Model string
+	Cores int
+	Count int
+}
+
+type Disk struct {
+	Name      string
+	Model     string
+	Serial    string
+	SizeBytes int64
+}
+
+type Inventory struct {
+	CPU         *CPU
+	MemoryBytes int64
+	Disks       []Disk
+}
+
+// Reality is the hardware-owned truth a running host reports, destined for the
+// NetBox reality side (interfaces + inventory).
+type Reality struct {
+	Device     string
+	Serial     string
+	Model      string
+	UUID       string
+	Interfaces []Interface
+	Inventory  *Inventory
+}
+
+// factBinding is one address binding under networking.interfaces.<n>.bindings
+// (IPv4) or .bindings6 (IPv6).
+type factBinding struct {
+	Address string `json:"address"`
+	Netmask string `json:"netmask"`
+}
+
+// shortName returns the leading label of a certname (prodnxsr0001.main… ->
+// prodnxsr0001), which is the NetBox device name.
+func shortName(certname string) string {
+	if i := strings.IndexByte(certname, '.'); i >= 0 {
+		return certname[:i]
+	}
+	return certname
+}
+
+// factsToReality maps a Facter/PuppetDB factset to the reality we record.
+func factsToReality(certname string, facts map[string]json.RawMessage) Reality {
+	r := Reality{Device: shortName(certname)}
+
+	var dmi struct {
+		Product struct {
+			Name   string `json:"name"`
+			UUID   string `json:"uuid"`
+			Serial string `json:"serial_number"`
+		} `json:"product"`
+	}
+	getFact(facts, "dmi", &dmi)
+	r.Serial = firstNonEmpty(dmi.Product.Serial, getStringFact(facts, "serialnumber"))
+	r.Model = firstNonEmpty(dmi.Product.Name, getStringFact(facts, "productname"))
+	r.UUID = firstNonEmpty(dmi.Product.UUID, getStringFact(facts, "uuid"))
+
+	r.Interfaces = interfaces(facts)
+	r.Inventory = inventory(facts)
+	return r
+}
+
+// interfaces enumerates recordable NICs. A physical NIC is always kept (it is
+// real hardware even when down); a virtual interface is kept only when it holds
+// a routable address, which naturally drops the ephemeral Calico veths (link-
+// local only) and lo (loopback only) while keeping overlay/loopback/kube-lb
+// interfaces. Interface names are never assumed — they come straight from Facter.
+func interfaces(facts map[string]json.RawMessage) []Interface {
+	var networking struct {
+		Interfaces map[string]struct {
+			MAC       string        `json:"mac"`
+			MTU       int           `json:"mtu"`
+			Physical  bool          `json:"physical"`
+			Bindings  []factBinding `json:"bindings"`
+			Bindings6 []factBinding `json:"bindings6"`
+		} `json:"interfaces"`
+	}
+	getFact(facts, "networking", &networking)
+
+	var out []Interface
+	for name, iface := range networking.Interfaces {
+		var ips []string
+		for _, b := range append(append([]factBinding{}, iface.Bindings...), iface.Bindings6...) {
+			ip := net.ParseIP(b.Address)
+			if ip == nil || ip.IsLoopback() || ip.IsLinkLocalUnicast() ||
+				ip.IsLinkLocalMulticast() || ip.IsUnspecified() {
+				continue
+			}
+			ips = append(ips, toCIDR(b.Address, b.Netmask))
+		}
+		if !iface.Physical && len(ips) == 0 {
+			continue
+		}
+		mac := iface.MAC
+		if strings.EqualFold(mac, placeholderMAC) {
+			mac = ""
+		}
+		sort.Strings(ips)
+		out = append(out, Interface{
+			Name:     name,
+			MAC:      mac,
+			MTU:      iface.MTU,
+			Physical: iface.Physical,
+			IPs:      dedupe(ips),
+		})
+	}
+	sort.Slice(out, func(i, j int) bool { return out[i].Name < out[j].Name })
+	return out
+}
+
+// inventory collects CPU/RAM/disk reality. Disks with a virtual-device name are
+// skipped so the output only reflects physical hardware.
+func inventory(facts map[string]json.RawMessage) *Inventory {
+	var processors struct {
+		Count  int      `json:"count"`
+		Cores  int      `json:"cores"`
+		Models []string `json:"models"`
+	}
+	var memory struct {
+		System struct {
+			TotalBytes int64 `json:"total_bytes"`
+		} `json:"system"`
+	}
+	var disks map[string]struct {
+		Model     string `json:"model"`
+		Serial    string `json:"serial"`
+		SizeBytes int64  `json:"size_bytes"`
+	}
+	getFact(facts, "processors", &processors)
+	getFact(facts, "memory", &memory)
+	getFact(facts, "disks", &disks)
+
+	inv := &Inventory{MemoryBytes: memory.System.TotalBytes}
+	if len(processors.Models) > 0 || processors.Count > 0 {
+		model := ""
+		if len(processors.Models) > 0 {
+			model = processors.Models[0]
+		}
+		inv.CPU = &CPU{Model: model, Cores: processors.Cores, Count: processors.Count}
+	}
+
+	names := make([]string, 0, len(disks))
+	for n := range disks {
+		names = append(names, n)
+	}
+	sort.Strings(names)
+	for _, n := range names {
+		if isVirtualDisk(n) {
+			continue
+		}
+		d := disks[n]
+		inv.Disks = append(inv.Disks, Disk{Name: n, Model: d.Model, Serial: d.Serial, SizeBytes: d.SizeBytes})
+	}
+
+	if inv.CPU == nil && inv.MemoryBytes == 0 && len(inv.Disks) == 0 {
+		return nil
+	}
+	return inv
+}
+
+func isVirtualDisk(name string) bool {
+	for _, p := range virtualDiskPrefixes {
+		if strings.HasPrefix(name, p) {
+			return true
+		}
+	}
+	return false
+}
+
+// toCIDR renders address + netmask as address/prefixlen. Facter secondary
+// bindings can omit the netmask; those default to a host route (/32 or /128).
+func toCIDR(addr, netmask string) string {
+	return fmt.Sprintf("%s/%d", addr, maskToPrefix(addr, netmask))
+}
+
+func maskToPrefix(addr, netmask string) int {
+	v4 := net.ParseIP(addr).To4() != nil
+	hostBits := func() int {
+		if v4 {
+			return 32
+		}
+		return 128
+	}
+	if netmask == "" {
+		return hostBits()
+	}
+	m := net.ParseIP(netmask)
+	if m == nil {
+		return hostBits()
+	}
+	var mask net.IPMask
+	if v4 {
+		mask = net.IPMask(m.To4())
+	} else {
+		mask = net.IPMask(m.To16())
+	}
+	ones, bits := mask.Size()
+	if bits == 0 { // non-canonical mask
+		return hostBits()
+	}
+	return ones
+}
+
+func getFact(facts map[string]json.RawMessage, name string, dst any) {
+	if raw, ok := facts[name]; ok {
+		_ = json.Unmarshal(raw, dst)
+	}
+}
+
+func getStringFact(facts map[string]json.RawMessage, name string) string {
+	var s string
+	getFact(facts, name, &s)
+	return s
+}
+
+func firstNonEmpty(vals ...string) string {
+	for _, v := range vals {
+		if v != "" {
+			return v
+		}
+	}
+	return ""
+}
+
+func dedupe(in []string) []string {
+	if len(in) == 0 {
+		return in
+	}
+	out := in[:1]
+	for _, v := range in[1:] {
+		if v != out[len(out)-1] {
+			out = append(out, v)
+		}
+	}
+	return out
+}
diff --git a/tools/backfill/reality_test.go b/tools/backfill/reality_test.go
new file mode 100644
index 0000000..a2fdb57
--- /dev/null
+++ b/tools/backfill/reality_test.go
@@ -0,0 +1,168 @@
+package main
+
+import (
+	"encoding/json"
+	"os"
+	"testing"
+)
+
+// loadFixture reads a PuppetDB /facts response fixture into a name->value map.
+func loadFixture(t *testing.T, path string) map[string]json.RawMessage {
+	t.Helper()
+	data, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("read fixture: %v", err)
+	}
+	var rows []factRecord
+	if err := json.Unmarshal(data, &rows); err != nil {
+		t.Fatalf("decode fixture: %v", err)
+	}
+	m := make(map[string]json.RawMessage, len(rows))
+	for _, r := range rows {
+		m[r.Name] = r.Value
+	}
+	return m
+}
+
+func realityFor(t *testing.T) Reality {
+	t.Helper()
+	facts := loadFixture(t, "testdata/facts_prodnxsr0001.json")
+	return factsToReality("prodnxsr0001.main.unkin.net", facts)
+}
+
+func TestFactsToRealityIdentity(t *testing.T) {
+	r := realityFor(t)
+	if r.Device != "prodnxsr0001" {
+		t.Errorf("device = %q, want prodnxsr0001", r.Device)
+	}
+	if r.Serial != "4RW6QM2" {
+		t.Errorf("serial = %q, want 4RW6QM2", r.Serial)
+	}
+	if r.Model != "OptiPlex 3050" {
+		t.Errorf("model = %q, want OptiPlex 3050", r.Model)
+	}
+	if r.UUID != "4c4c4544-0052-5710-8036-b4c04f514d32" {
+		t.Errorf("uuid = %q", r.UUID)
+	}
+}
+
+func TestInterfaceFiltering(t *testing.T) {
+	r := realityFor(t)
+	got := map[string]Interface{}
+	for _, i := range r.Interfaces {
+		got[i.Name] = i
+	}
+
+	// Real NICs, overlay, loopback and kube-lb interfaces are kept.
+	for _, want := range []string{"enp2s0", "enp3s0", "loopback0", "loopback1", "loopback2", "kube-lb0", "flannel.1"} {
+		if _, ok := got[want]; !ok {
+			t.Errorf("expected interface %q to be kept", want)
+		}
+	}
+	// lo (loopback only) and Calico veths (link-local only) are dropped.
+	for _, drop := range []string{"lo", "calid8d62485b84", "cali636724c6fe6"} {
+		if _, ok := got[drop]; ok {
+			t.Errorf("interface %q should have been dropped", drop)
+		}
+	}
+	// Placeholder Calico MAC never leaks onto a kept interface.
+	for _, i := range r.Interfaces {
+		if i.MAC == placeholderMAC {
+			t.Errorf("interface %q kept placeholder MAC", i.Name)
+		}
+	}
+}
+
+func TestInterfaceAddresses(t *testing.T) {
+	r := realityFor(t)
+	got := map[string]Interface{}
+	for _, i := range r.Interfaces {
+		got[i.Name] = i
+	}
+
+	// enp2s0: primary /24 plus an unmasked secondary that defaults to /32.
+	assertIPs(t, "enp2s0", got["enp2s0"].IPs, []string{"198.18.15.1/24", "198.18.19.1/32"})
+	// kube-lb0: eight VIPs, all /32, sorted and deduped.
+	assertIPs(t, "kube-lb0", got["kube-lb0"].IPs, []string{
+		"198.18.199.0/32", "198.18.200.0/32", "198.18.200.1/32", "198.18.200.2/32",
+		"198.18.200.3/32", "198.18.200.4/32", "198.18.200.5/32", "198.18.200.9/32",
+	})
+	// flannel.1: overlay /32.
+	assertIPs(t, "flannel.1", got["flannel.1"].IPs, []string{"10.42.0.0/32"})
+
+	if !got["enp2s0"].Physical {
+		t.Error("enp2s0 should be physical")
+	}
+	if got["loopback0"].Physical {
+		t.Error("loopback0 should be virtual")
+	}
+}
+
+func assertIPs(t *testing.T, iface string, got, want []string) {
+	t.Helper()
+	if len(got) != len(want) {
+		t.Errorf("%s ips = %v, want %v", iface, got, want)
+		return
+	}
+	for i := range want {
+		if got[i] != want[i] {
+			t.Errorf("%s ips = %v, want %v", iface, got, want)
+			return
+		}
+	}
+}
+
+func TestInventory(t *testing.T) {
+	r := realityFor(t)
+	if r.Inventory == nil {
+		t.Fatal("inventory is nil")
+	}
+	if r.Inventory.MemoryBytes != 33260900352 {
+		t.Errorf("memory = %d", r.Inventory.MemoryBytes)
+	}
+	if r.Inventory.CPU == nil || r.Inventory.CPU.Model != "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz" {
+		t.Errorf("cpu = %+v", r.Inventory.CPU)
+	}
+	if r.Inventory.CPU.Count != 4 {
+		t.Errorf("cpu count = %d, want 4", r.Inventory.CPU.Count)
+	}
+
+	names := map[string]Disk{}
+	for _, d := range r.Inventory.Disks {
+		names[d.Name] = d
+	}
+	// Physical disks kept; Ceph RBD volumes dropped.
+	if _, ok := names["sda"]; !ok {
+		t.Error("sda should be kept")
+	}
+	if _, ok := names["nvme0n1"]; !ok {
+		t.Error("nvme0n1 should be kept")
+	}
+	for _, drop := range []string{"rbd0", "rbd1", "rbd5"} {
+		if _, ok := names[drop]; ok {
+			t.Errorf("virtual disk %q should be dropped", drop)
+		}
+	}
+	if names["sda"].SizeBytes != 1200243695616 || names["sda"].Serial != "BTHC651303WB1P2OGN" {
+		t.Errorf("sda = %+v", names["sda"])
+	}
+}
+
+func TestMaskToPrefix(t *testing.T) {
+	cases := []struct {
+		addr, mask string
+		want       int
+	}{
+		{"198.18.15.1", "255.255.255.0", 24},
+		{"198.18.19.1", "255.255.255.255", 32},
+		{"198.18.19.1", "", 32},        // unmasked secondary
+		{"198.18.19.1", "garbage", 32}, // unparseable mask
+		{"fd00::1", "", 128},           // v6 default
+		{"fd00::1", "ffff:ffff:ffff:ffff::", 64},
+	}
+	for _, c := range cases {
+		if got := maskToPrefix(c.addr, c.mask); got != c.want {
+			t.Errorf("maskToPrefix(%q,%q) = %d, want %d", c.addr, c.mask, got, c.want)
+		}
+	}
+}
diff --git a/tools/backfill/testdata/facts_prodnxsr0001.json b/tools/backfill/testdata/facts_prodnxsr0001.json
new file mode 100644
index 0000000..0842680
--- /dev/null
+++ b/tools/backfill/testdata/facts_prodnxsr0001.json
@@ -0,0 +1,461 @@
+[
+  {
+    "certname": "prodnxsr0001.main.unkin.net",
+    "environment": "develop",
+    "name": "dmi",
+    "value": {
+      "bios": {
+        "release_date": "09/19/2023",
+        "vendor": "Dell Inc.",
+        "version": "1.27.0"
+      },
+      "board": {
+        "manufacturer": "Dell Inc.",
+        "product": "0JP3NX",
+        "serial_number": "/4RW6QM2/CNPE1007AP0J4Q/"
+      },
+      "chassis": {
+        "type": "Desktop"
+      },
+      "manufacturer": "Dell Inc.",
+      "product": {
+        "name": "OptiPlex 3050",
+        "serial_number": "4RW6QM2",
+        "uuid": "4c4c4544-0052-5710-8036-b4c04f514d32"
+      }
+    }
+  },
+  {
+    "certname": "prodnxsr0001.main.unkin.net",
+    "environment": "develop",
+    "name": "networking",
+    "value": {
+      "domain": "main.unkin.net",
+      "fqdn": "prodnxsr0001.main.unkin.net",
+      "hostname": "prodnxsr0001",
+      "interfaces": {
+        "cali636724c6fe6": {
+          "bindings6": [
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+      "network": "198.18.15.0",
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+        "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz",
+        "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz",
+        "Intel(R) Core(TM) i5-7500T CPU @ 2.70GHz"
+      ],
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+      "speed": "3.10 GHz",
+      "threads": 1
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+  {
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+    "environment": "develop",
+    "name": "serialnumber",
+    "value": "4RW6QM2"
+  },
+  {
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+    "environment": "develop",
+    "name": "productname",
+    "value": "OptiPlex 3050"
+  },
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+    "environment": "develop",
+    "name": "uuid",
+    "value": "4c4c4544-0052-5710-8036-b4c04f514d32"
+  }
+]