Reverse DNS (RDNS) Lookup Tool

The Domain Name System is used to determine what IP address is associated with a given domain name. So, to reverse-resolve a known IP address is to look up what the associated domain name is belonging to that IP address.

RDNS Look Up:

Type IP Address :


  • RDNS lookups for IPv4 addresses use a reverse IN-ADDR entry in the special domain
  • An IPv4 address is represented in the domain by a sequence of bytes in reverse order, represented as decimal numbers, separated by dots with the suffix
  • For example, the reverse lookup domain name corresponding to the IPv4 address is

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