Toward deprecation

RFC 1886, published in December 1995, defines for reverse mapping of IPv6 addresses.

RFC 3152, published in August 2001, defines to use instead of Please refer to IAB’s message to know the reasons. RFC 4159, published in August 2005, describes as follows:

The Regional Internet Registries (RIRs) are advised that maintenance of delegation of entries in “” is no longer required as part of infrastructure services in support of Internet Standards Conformant IPv6 implementations as of 1 September 2005.

All RIRs will stop maintenance of the delegated domains under on 1 June, 2006.