Registered to the PrivateWire VPN product of the 1990s; effectively extinct today.
IANA carries 4449 as PrivateWire, registered by Uri Resnitzky for an early commercial encrypted-tunnel product. The software is long gone from the market and there is no public protocol specification. An open 4449 today is far more likely to be an in-house or bespoke service that took the number than an actual PrivateWire gateway.
Expose with care
The registration tells you nothing useful — fingerprint the listener before deciding whether it belongs on a public address.
$ nc -vz -w 3 TARGET 4449Seen 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.