Unregistered; no standard service, no documented reputation.
9485 has no IANA assignment and nmap's services table lists it as unknown. Nothing in the registry or the common service databases claims it, so an open 9485 is whatever a local application chose. Fingerprint it on the host.
Expose with care
Classify it by the service you find; an unregistered port inherits no default verdict.
$ nmap -sV -Pn -p 9485 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.