Registered · Cross-platform

5351 NAT-PMP / PCP

TCP Reserved
UDP Yes
SCTP —
DCCP —

What it is

NAT Port Mapping / Port Control Protocol.

When / why

Client-requested NAT port forwarding.

Protocol status detail

TransportStatusMeaning
TCP Reserved Reserved by IANA, generally to prevent collisions after a withdrawn assignment.
UDP Yes Assigned by IANA and standardized, specified, or widely used on this port.
SCTP — Not applicable for this transport.
DCCP — Not applicable for this transport.
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Port range

Registered (1024–49151). Assigned by IANA on request; usable without elevated privileges on most systems.

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