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I wonder if Android has support for IPv6? I have heard that the phone company I use has support for IPv6 and I have a IPv6 address if I visit http://ipv6.whatismyipv6.net.ipv4.sixxs.org/.
But I can not visit IPv6-only sites like http://ipv6.google.com, why is that? Does Android have support for IPv6?
As of Android 6.0, the majority of the IPv6 protocol seems to be supported with significant parts missing such as DHCPv6. Check this Google thread for more info, specifically the issues listed in this post.
Updating this question to say that as of Android 4.0, IPv6 is fairly well supported. There are still no visual indicators that it is running/working, but devices pick up IPv6 addresses and try to use them by default.
No, as of late 2013, even the newest Android devices still don't support IPv6-only WiFi networks.
Source: http://code.google.com/p/android/issues/detail?id=32630
It should be fully supported since Lollipop, except for DHCPv6 - see the thread Matthew referred to
Android 5.1.1 supports IPv6. Here you han a screenshot of the console ‘netstat’ command (https://twitter.com/juan_domenech/status/732535218662412288). You can also check this typing ‘what is my ip’ on Google and observing whether you have an IPv4 or an IPv6 coming back (only in IPv6 WiFi networks obviously). Turns out that DHCPv6 is not necessary after all (SLAAC might be in place here).
