Registered to a search appliance nobody runs any more, so a listener here today is almost always someone's own app.
IANA registers 8765 as ultraseek-http, the HTTP interface of the Ultraseek enterprise search server (Infoseek, later Verity and Autonomy). That product has been out of circulation for years, so the registration is history rather than a prediction. What you actually find on 8765 is usually an unrelated service that picked a memorable four-digit port. Identify the process before assuming anything about the protocol.
Expose with care
The verdict depends entirely on what is really bound there; treat an unidentified HTTP-ish listener as unauthenticated until you have checked.
$ sudo lsof -nP -iTCP:8765 -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.