Port 53

Q: What is port 53?

Resolves domain names to IP addresses (DNS) DNS (Domain Name System) on port 53 is the "phone book" of the internet, translating human-readable domain names (e.g., google.com) into IP addresses. It uses UDP for fast queries and TCP for large responses or zone transfers. An open recursive DNS resolver exposed to the internet can be abused for DNS amplification DDoS attacks. Modern encrypted alternatives include DNS over HTTPS (DoH) and DNS over TLS (DoT).

DNS

Resolves domain names to IP addresses (DNS)

Port

Protocol

BOTH

Service

DNS

Security

Restricted

Full name: Domain Name System

What is port 53?

DNS (Domain Name System) on port 53 is the "phone book" of the internet, translating human-readable domain names (e.g., google.com) into IP addresses. It uses UDP for fast queries and TCP for large responses or zone transfers. An open recursive DNS resolver exposed to the internet can be abused for DNS amplification DDoS attacks. Modern encrypted alternatives include DNS over HTTPS (DoH) and DNS over TLS (DoT).

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