Registered as "WinDb" and otherwise undocumented.
IANA registers 2522 as windb, "WinDb". The registration carries no protocol description and no reference document, and there is no commonly deployed software that binds this port by default. It is a name in the registry, not a protocol you will identify from a scan — look at the listening process instead.
Expose with care
Unknown service; the registration tells you nothing about whether it authenticates or encrypts, so identify it before allowing any traffic to it.
$ sudo lsof -nP -iTCP:2522 -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.