Reverse lookup A reverse DNS lookup is a query of the DNS for domain names when the IP address is known. Multiple domain names may be associated with an IP address. The DNS stores IP addresses in the form of domain names as specially formatted names in pointer (PTR) records within the infrastructure top-level domain arpa. For IPv4, the domain is in-addr.arpa. For IPv6, the reverse lookup domain is ip6.arpa. The IP address is represented as a name in reverse-ordered octet representation for IPv4, and reverse-ordered nibble representation for IPv6.
reverse lookup a reverse dns lookup is a query of the dns for domain names when the ip address is known multiple domain names may be associated with an ip address the dns stores ip addresses in the form of domain names as specially formatted names in pointer (ptr) records within the infrastructure top-level domain arpa for ipv4 the domain is in-addrarpa for ipv6 the reverse lookup domain is ip6arpa the ip address is represented as a name in reverse-ordered octet representation for ipv4 and reverse-ordered nibble representation for ipv6