IPv6 & DNS

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Reverse mapping & Binary labels

example of an IPv6 address

     3ffe:1900:4545:2:2d0:9ff:fef7:6d2c

This would map in the IPv6 .ip6.arpa. tree as follows.

     \[x3ffe19004545000202d009fffef76d2c/128].ip6.arpa. PTR ns.example.com.

Binary labels start with \[ and end with ]

x defines the base (this case hexadecimal number).

/128 defines count of significant bits.