What exactly does “deprecation of ip6.int reverse DNS service” mean, and why was it done?
At 00:00 UTC, Thursday 1 June, 2006, all sub-domains under 1.0.0.2.ip6.int were withdrawn. This reflects a decision taken by the IAB in August 2005 to cease use of ip6.int for reverse DNS registration, and an agreement between the IETF and the RIR community to remove these entries on 1 June, 2006. The decision to withdraw ip6.int is documented in RFC3152, which specifies that reverse DNS domains in IPv6 should be registered under ip6.arpa.