Unassigned by IANA — the first of the 34571-34573 block that scanners list with no name attached.
IANA has no registration for 34571, and Nmap carries it as unknown with an open frequency near 0.04%. Its two neighbours, 34572 and 34573, are equally unregistered, which is why the three tend to appear together in port lists rather than because any documented protocol claims them. On a Linux host the number is also inside the default ephemeral range, so transient sockets show up here routinely.
Expose with care
Treat it as an unknown service: fingerprint the listener and confirm what owns it before exposing anything on it.
$ nmap -sV -Pn -p 34571 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.