Registered · Cross-platform

4500 IPsec NAT-T

TCP Assigned
UDP Yes
SCTP —
DCCP —

What it is

IPsec NAT Traversal (encapsulates ESP in UDP).

When / why

IPsec VPNs through NAT. Open alongside UDP/500.

Protocol status detail

TransportStatusMeaning
TCP Assigned Assigned by IANA, but not standardized, specified, or widely used on this port.
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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