Unassigned by IANA and unnamed in Nmap's database — a genuinely empty port number.
Like its neighbours, 7929 sits in IANA's 7914-7931 Unassigned block. Nmap records it as unknown with an open-port frequency of about 0.00015, which puts it among the rarest ports it tracks. Nothing well-documented — no product default, no malware family — is associated with the number itself. If you find it open, the service is application-specific and must be fingerprinted.
Expose with care
There is no protocol here to judge; judge the listener. An unknown service on a public IP is a finding, not a configuration.
$ nmap -sV -Pn -p 7929 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.