Nothing is registered here — a listener on 5214 is some application's own pick.
IANA lists 5210-5214 as unassigned, so there is no service name and no protocol that belongs to this port. No widely deployed product uses it by convention either, which means the port number tells you nothing about what is behind it. If a scan shows it open, identify the process on the host rather than guessing from a port list.
Expose with care
An unidentified listener is unreviewed by definition — find the owning process before deciding whether it may be reachable at all.
$ sudo lsof -nP -iTCP:5214 -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.