Unassigned at IANA, with no known service behind it.
IANA lists 6691-6695 as Unassigned, and nmap's database has no name for 6692. There is no registered protocol and no documented product default. If it is open, some local application chose it; the port number itself tells you nothing.
Expose with care
Nothing standard should be listening. Name the process before you decide whether the listener is wanted.
$ sudo lsof -nP -iTCP:6692 -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.