// REFERENCE
Port 53 (DNS)
Protocol: TCP/UDP
Service: DNS
Medium risk
DNS: resolves names to IPs. Uses UDP for normal queries and TCP for large responses and zone transfers (AXFR). An open resolver can be abused for DDoS amplification; restrict recursion.
Related tools
Work with this in:
Related
88
Port 88 (Kerberos) 389
Port 389 (LDAP) 636
Port 636 (LDAPS) 43
Port 43 (WHOIS) 853
Port 853 (DNS over TLS) 3268
Port 3268 (AD Global Catalog)
Port 88 (Kerberos) 389
Port 389 (LDAP) 636
Port 636 (LDAPS) 43
Port 43 (WHOIS) 853
Port 853 (DNS over TLS) 3268
Port 3268 (AD Global Catalog)
Assignments per the IANA port registry. Educational content.