An old Sun N1 registration with no live protocol behind it; treat a listener here as unidentified.
IANA lists 4446 as N1-FWP, a name from Sun Microsystems' N1 provisioning product line, with no reference document or current implementation. Nothing in common use binds 4446 by default and scan frequency is negligible. If it is open, the answer comes from fingerprinting the service, not from the registry.
Expose with care
No standard service to judge — identify what answers and apply that service's rules.
$ nc -vz -w 3 TARGET 4446Seen 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.