Port 4500 — IPsec NAT-T
Quick reference for TCP/UDP port 4500, used by IPsec NAT-T. Includes what the service does, security guidance and related ports.
Port
4500
Protocol
UDP
Service
IPsec NAT-T
What is port 4500?
IPsec NAT traversal.
What port does IPsec NAT-T use?
IPsec NAT-T listens on port 4500 by default.
Security guidance
Low risk — designed for public exposure
Port 4500 (IPsec NAT-T) is designed for public exposure. Standard hardening (TLS certs, current firmware, sensible rate limits) is enough — no special isolation needed.
Related ports
Frequently asked
What is port 4500 used for?+
Port 4500 is the standard TCP/UDP port for IPsec NAT-T. IPsec NAT traversal.
What port does IPsec NAT-T use?+
IPsec NAT-T listens on port 4500 by default.
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