Rosetta Code:IPv6
Rosetta Code is dual-stacked, with native IPv6 connectivity through its VPS host provider, and operates just fine over IPv6. My regular access to Rosetta Code has been via IPv6 for some time, now.
The IPv6 address is 2605:2700:0:3::4713:91bf, and there is already a AAAA record in DNS for 'rosettacode.org'. All content-holding subdomains of 'rosettacode.org' 301-redirect to a path under http://rosettacode.org/, so accessing any Rosetta code site will ultimately connect you to Rosetta Code, if you have suitable (i.e. non-Teredo, non-6to4) IPv6 network connectivity.
Rosetta Code's DNS servers are also dual-stacked: ns2.he.net, ns3.he.net, ns4.he.net, ns5.he.net.
The only known problem with Rosetta Code's IPv6 access, currently, is that the route between AS41075 and AS18779 appears to break at AS8928.