Unassigned on both TCP and UDP, with no service name anywhere in the public record.
IANA has 22939 inside the unassigned block 22801-22950; no vendor or protocol has claimed it. Nmap carries 'unknown' entries for both 22939/tcp and 22939/udp with low open-frequencies, enough to include the TCP side in the default scan set. There is no documented default that uses this number, so an open port means a locally chosen listener — a custom service, a tunnel endpoint, or a remapped container port.
Expose with care
Decide from the fingerprint. An unnamed port carrying a real service still carries that service's risk.
$ nmap -Pn -sV -p 22939 --reason TARGETSeen 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.