Unassigned by IANA; unnamed in Nmap's table and usually reported next to 27352.
IANA places 27353 in the unassigned block 27346-27441. Nmap lists it as 'unknown' with an open-frequency close to that of 27352, 27355 and 27356, so the four show up as a cluster in scan results without any of them being identified. No product default, protocol, or documented malware family claims this number. Read the banner, not the port.
Expose with care
Nothing standard listens here. Fingerprint the service and apply its rules rather than the port's.
$ nmap -Pn -sV -p 27353 --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.