Home Assistant's web UI and REST API — or, on a database host, the ClickHouse HTTP interface.
Home Assistant serves its frontend, REST API, and WebSocket API over HTTP on 8123 by default; container and Core installs still use it, while Home Assistant OS moved its default to port 80 in the 2026.8 release. It shows up on scans of home LANs from a Raspberry Pi, NUC, or NAS running HA. Unrelated but common in server fleets: clickhouse-server listens on 8123 for its HTTP interface, and a bare GET / there returns the string "Ok.".
Expose with care
Home Assistant has real user authentication but ships plain HTTP by default and controls locks and cameras — put it behind a reverse proxy with TLS or a VPN rather than forwarding 8123.
$ curl -s -m 3 -o /dev/null -w '%{http_code} %{content_type}\n' http://TARGET:8123/Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.