Another round unregistered number — chosen by hand when it is chosen at all.
IANA lists nothing for 45100 and Nmap has no name for it, though its open frequency of about 0.07% is on the higher side for this neighbourhood. Tidy numbers like 45100 are typical picks for internal or vendor-specific services that never bothered with a registration. Being inside the Linux ephemeral range, it also collects incidental client sockets.
Expose with care
Unregistered does not mean unimportant — run a version scan, and if it turns out to be an admin or database interface, treat it by what it is, not by its port.
$ nmap -sV -Pn -p 45100 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.