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Reverse DNS generator

Turn an IPv4 or IPv6 address into an in-addr.arpa or ip6.arpa PTR owner name.

IP address Prefix length (optional) PTR hostname

PTR

Zone names

Address	PTR owner
`203.0.113.10`	`10.113.0.203.in-addr.arpa`
`203.0.113.0/24`	zone `113.0.203.in-addr.arpa`
`2001:db8::/32`	zone `8.b.d.0.1.0.0.2.ip6.arpa`