The invisible domain which handles reverse resolve requests exclusively. The IP addresses within this special zone are represented backwards. For example, 192.168.20.1 is actually 1.20.168.192.in-addr.arpa. This is due to the hierarchical nature of DNS (i.e. the owner of "192.in-addr.arpa" also owns "1.20.160.192.in-addr.arpa", but not "in-addr.arpa" itself). Naturally, this isn't true with IP addresses.

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