Reverse Lookup
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When a source host establishes a connection to a destination
host, the TCP/IP packets carry out only IP addresses of the source
host;
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For authentication, access rights or accounting information,
the destination host wants to know the name of the source
host;
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For this purpose, a special domain “in-addr.arpa”
is used;
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The reverse name is obtained by reversing the IP number and
adding the name “in-addr.arpa”;
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Example: address: 130.65.240.254
reverse name: 254.240.65.130.in-addr.arpa
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Reverse domains form a hierarchical tree and are treated as any
other Internet domain.