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.