No registration and no documented service — a number Nmap probes and nothing claims.
54045 is inside the Dynamic/Private range, so there is no IANA record for it and never will be under RFC 6335. Nmap's nmap-services lists TCP at 0.000228 and UDP at 0.001004, keeping it in the default top-1000 TCP scan. The SANS ISC port page leaves the service field blank; the only attributions there are unsourced visitor comments, which are not evidence. Treat a listener here as an unidentified local application.
Expose with care
Nothing is known about what runs here, so nothing about its authentication or encryption can be assumed. Identify first, expose never-by-default.
$ sudo lsof -nP -iTCP:54045 -sTCP:LISTENSeen 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.