Unassigned; the last of the 34571-34573 run and just as anonymous as the other two.
34573 carries no IANA registration and no name in Nmap's service database, with a measured open frequency around 0.04%. Unlike 34571 and 34572 it has no UDP counterpart in Nmap's data at all, which is a fair sign that sightings are incidental rather than a protocol. As with the rest of the 32768-60999 band on Linux, an open socket here may simply be an outbound connection.
Expose with care
Nothing is known to run here by convention, so an open port means an unidentified service — fingerprint first.
$ nmap -sV -Pn -p 34573 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.