re. 6to4: agreed, and never will, see https://tools.ietf.org/html/rfc7526 https://tools.ietf.org/html/rfc7526 re NAT64: not so agreed... 1. T-Mobile USA: they

re. 6to4: agreed, and never will, see https://tools.ietf.org/html/rfc7526 https://tools.ietf.org/html/rfc7526 re NAT64: not so agreed... 1. T-Mobile USA: they have few millions of IPv6-only subscribers using 464XLAT which has NAT64 as a component. 2. Starting from iOS9, every app submitted to App Store will have to work with IPv6 or across the NAT64 as a criterion for appstore submission: http://www.internetsociety.org/deploy360/blog/2015/06/apple-will-require-ipv6-support-for-all-ios-9-apps/ http://www.internetsociety.org/deploy360/blog/2015/06/apple-... 3. my own anecdata from the IPv6-only default WiFi SSID at FOSDEM conference in Brussels this year is that ~40% of the total devices were able to use IPv6-only SSID behind NAT64 - up from about 15-20% last year. Will be interesting to see the numbers for the next year - with Android 5.0 shipping RDNSS and Apple's move with iOS, this number should go up noticeably.