← Port Encyclopedia
53
DNS
TCP/UDP
DNS Critical Risk
Domain Name System — DNS queries and zone transfers, DNS hijacking, cache poisoning

🔍 How to Scan Port 53

nmap -sV -p 53 target
nmap -sV -sC --script=banner -p 53 target
nc -zv target 53

🛡️ Security Considerations

  • Scan port 53 with nmap -sV to identify the exact service and version
  • If DNS is not needed, close or firewall this port immediately
  • Check for default credentials if a management interface runs on this port
  • Use searchsploit dns to find known exploits
  • Monitor traffic on port 53 with Wireshark or tcpdump for anomalies
  • Ensure the service is patched to the latest version to prevent known CVE exploitation

🔗 Related DNS Ports

Port 4022
DNSSEC

📍 Nearby Ports

Port 48
Port-48
Port 49
TACACS
Port 50
Port-50
Port 51
Port-51
Port 52
Port-52
Port 54
Port-54
Port 55
Port-55
Port 56
Port-56
Port 57
Port-57
Port 58
Port-58
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