No IANA registration — commonly a vendor-private listener, often on printers.
9220 is unassigned in the IANA registry and unknown to nmap's services file. It turns up on multifunction office devices and other appliances as a vendor-chosen management or scan-related port, so the device's own documentation is the authority, not the port number. Confirm with a version scan against the actual host.
Expose with care
Appliance-private ports are usually unauthenticated management surfaces; keep them on the device VLAN until you know exactly what answers.
$ nmap -sV -Pn -p 9220 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.