Registered to "radio free ethernet", an old broadcast audio experiment — effectively a free port today.
IANA lists 5002 as rfe, "radio free ethernet", one of the early-1990s registrations that never grew a public specification or a surviving implementation. Nothing widely deployed claims it now, so a listener here is almost always an application that picked a round number near 5000. Treat the registered name as trivia and identify the service from its banner.
Expose with care
The port number carries no security meaning. Judge exposure by whatever process actually owns the socket.
$ sudo lsof -nP -iTCP:5002 -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.