Unassigned by IANA — the registry has hivep at 12172 and then nothing until 12300.
12174 has no IANA registration; the nearest assignments are hivep (12172, HiveP) below it and linogridengine (12300, LinoGrid Engine) above. Nmap records the port as unknown with a very low observed frequency. No documented product default and no known malware family uses it, so a listener here is a locally chosen port and the only way to identify it is to look at what answers.
Expose with care
Unregistered and unfingerprinted. Determine the service before treating the port as safe to expose.
$ nmap -Pn -sV -p 12174 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.