Special Use Domain Name 'ipv4only.arpa'
RFC 8880

Received changes through RFC Editor sync (created alias RFC 8880, changed abstract to 'NAT64 (Network Address and Protocol Translation from IPv6 Clients to IPv4 Servers) allows client devices using IPv6 to communicate with servers that have only IPv4 connectivity.

The specification for how a client discovers its local network's NAT64 prefix (RFC 7050) defines the special name 'ipv4only.arpa' for this purpose. However, in its Domain Name Reservation Considerations section (Section 8.1), that specification (RFC 7050) indicates that the name actually has no particularly special properties that would require special handling.

Consequently, despite the well-articulated special purpose of the name, 'ipv4only.arpa' was not recorded in the Special-Use Domain Names registry as a name with special properties.

This document updates RFC 7050. It describes the special treatment required and formally declares the special properties of the name. It also adds similar declarations for the corresponding reverse mapping names.', changed pages to 17, changed standardization level to Proposed Standard, changed state to RFC, added RFC published event at 2020-08-31, changed IESG state to RFC Published, created updates relation between draft-cheshire-sudn-ipv4only-dot-arpa and RFC 7050)