The upper half of the 25734/25735 pair — also unassigned, also unnamed.
Like its neighbour, 25735 falls in IANA's unassigned block 25605-25792 with no registration on TCP or UDP. Nmap carries 'unknown' entries for both transports at a low open-frequency. No published product default, RFC, or malware report claims it. Anything found here is site-specific and needs to be identified from its banner rather than its number.
Expose with care
No standard service, so no default verdict. Version-scan it and judge the answer.
$ nmap -Pn -sV -p 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.