The most well-known type of DNS query is the one used to identify the IP address or addresses for a given domain name: the type A query. Conversely, a reverse DNS lookup is performed to identify the domain name or names associated with a given IP address. A reverse DNS domain is built from the IP address. This process involves reversing the bytes of the IPv4 address or nibbles of an IPv6 address and appending a special domain within the .arpa TLD (in-addr.arpa for IPv4 addresses and ip6.arpa for IPv6 addresses).
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