IANA leaves 10617 unassigned and no convention has claimed it; a listener here was configured on purpose.
IANA has nothing registered on 10617 — the registry jumps from serverdocs (10548, Apple Document Sharing) straight to printopia (10631), leaving this whole stretch empty. Nmap's service database also carries it as unknown, seen on roughly 0.04% of scanned hosts, which is background noise rather than a fingerprint of any product. It also sits well below the Linux ephemeral range (32768 and up), so a process bound here was told to bind here by a config file or a container port mapping. Identify it by its banner, not by the number.
Expose with care
An unregistered high port tells you nothing about what is behind it. Fingerprint the listener before deciding whether it belongs on a public interface.
$ nmap -Pn -sV -p 10617 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.