Unassigned, unnamed, and usually seen next to 25735 — a pair with no documented owner.
IANA has 25734 inside the unassigned range 25605-25792. Nmap lists it as 'unknown' with a small open-frequency, and the adjacent 25735 carries a separate 'unknown' entry, so the two are commonly reported together. No public documentation names a product that binds either. The pairing is suggestive of a single application using consecutive ports, but nothing verifiable identifies it.
Expose with care
Unknown listener. Fingerprint it, and if it turns out to be part of an application's control pair, apply that application's rules.
$ nmap -Pn -sV -p 25734,25735 --reason 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.