I tested Skype back in January on IPv6only+NAT64, worked for me. Anyway given this: http://www.internetsociety.org/deploy360/blog/2015/06/apple-will-require-ip

I tested Skype back in January on IPv6only+NAT64, worked for me. Anyway given this: 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-..., the days of "Apps not working with IPv6" are counted.