A single unassigned port wedged between INDI on 7624 and SIMCO on 7626.
IANA assigns 7624 to indi (Instrument Neutral Distributed Interface, the astronomy device-control protocol) and 7626 to simco, but leaves 7625 unassigned. Nmap gives it no service name and an open-port frequency near 0.04%. If you find 7625 open on an observatory or astrophotography box, the interesting neighbour is 7624, not this port; on anything else it is a locally chosen number.
Expose with care
Unregistered and unidentified. Find the listening process first; adjacent INDI on 7624 is itself an unauthenticated device-control protocol that should stay on the LAN.
$ sudo lsof -nP -iTCP:7625 -sTCP:LISTENSeen 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.