DNS

Low Risk

TCP/UDP — DNS

Port Overview

Port Number 53

Service Name DNS

Transport Protocol TCP/UDP

Category DNS

Security Risk Low

Port Range Well-Known (0-1023)

What is Port 53?

Domain Name System. Translates human-readable domain names (e.g., example.com) into IP addresses. TCP is used for zone transfers and large responses; UDP for standard queries.

TCP/UDP DNS Commonly Used

Security Considerations

Port 53 (DNS) is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose.

Recommendation: Standard security practices apply. Keep software updated and monitor access.

Related Ports — DNS

42 WINS / nameserver 101 NIC Host Name 853 DNS over TLS 953 RNDC 1512 WINS 2053 Knetd / DNS over TLS 5353 mDNS (Multicast DNS) 5355 LLMNR (Link-Local Multicast Name Resolution)