An IANA registration with no assignee on record and no public documentation — in practice, a spillover dev port next to 4000 and 4001.
IANA registers 4002 as pxc-spvr-ft, part of a small block (4002–4007: pxc-spvr-ft, pxc-splr-ft, pxc-roid, pxc-pin, pxc-spvr, pxc-splr) whose registry rows carry no assignee and no reference. No specification or vendor documentation for the pxc services is publicly available. What you actually find on 4002 is usually a second local service that took the next free port after 4000 or 4001 — a dev server, an API stub, a container's second port mapping.
Expose with care
Nothing meaningful is registered here in practice, so a public 4002 is an unidentified service — find the process first; if it is a dev server or debug endpoint, it should not be listening publicly at all.
$ sudo lsof -nP -iTCP:4002 -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.