Unregistered; historically associated with the Internet/Intranet Input Method Server Framework.
There is no IANA assignment for 50002 because it lies in the Dynamic/Private range. Nmap's service database names it iiimsf — the Internet/Intranet Input Method Server Framework, the input-method server used by Solaris-era desktops — which is the only well-attested association the number has. On modern systems an open 50002 is far more likely to be an arbitrary application port in a 50000-based block than an IIIM server, so identify it rather than trusting the label.
Expose with care
A desktop input-method server has no business on a network interface at all; anything else here is unidentified until you fingerprint it.
$ nmap -Pn -sV -p 50002 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.