IPv6 Reverse DNS (ip6.arpa)
Convert an IPv6 address or prefix to its ip6.arpa reverse-DNS zone (or the exact set of zones a non-nibble prefix needs), and turn an ip6.arpa name back into an address.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
How it works
Address → name reverses the 32 hex nibbles and appends ip6.arpa. ip6.arpa carries one nibble per DNS label, so a zone can only be cut every 4 bits: a /prefix that is a multiple of 4 is a single zone, while a prefix that is not (/33, /35, …) has no zone of its own and is listed as the 2, 4, or 8 child zones at the next nibble boundary that cover it exactly. Name → address reverses the process; a partial name yields the prefix network with trailing zeros, and bare ip6.arpa is the ::/0 apex of the tree.