Reverse DNS Lookup

Find the hostname associated with an IP address. Reverse DNS lookup queries PTR records to resolve IP addresses back to domain names.

Common IP addresses to test:

Common nameservers:

About Reverse DNS

Common Uses

  • • Email server verification
  • • Network troubleshooting
  • • Security analysis
  • • Log file analysis

PTR Records

  • • Maps IP to hostname
  • • Stored in reverse zones
  • • Not always configured
  • • Important for mail servers

IPv4 vs IPv6

  • • IPv4: in-addr.arpa zone
  • • IPv6: ip6.arpa zone
  • • Both use PTR records
  • • Same lookup process