Port 53 — DNS
Quick reference for TCP/UDP port 53, used by DNS. Includes what the service does, security guidance and related ports.
Port
53
Protocol
TCP/UDP
Service
DNS
What is port 53?
Domain Name System lookups.
What port does DNS use?
DNS listens on port 53 by default.
Security guidance
Low risk — designed for public exposure
Port 53 (DNS) 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 53 used for?+
Port 53 is the standard TCP/UDP port for DNS. Domain Name System lookups.
What port does DNS use?+
DNS listens on port 53 by default.
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