No IANA registration; nothing standard listens here.
9110 has no entry in the IANA registry and appears in nmap's services table only as unknown. It sits next to the JetDirect and Bacula cluster in the low 9100s, so an open 9110 on a printer or backup host is worth checking against that vendor's own port list, but the number itself implies nothing. Identify the process on the host before drawing conclusions.
Expose with care
Unregistered does not mean unimportant — fingerprint the listener and apply the verdict that service deserves.
$ nmap -sV -Pn -p 9110 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.