The Lithuanian research and education network LITNET has introduced the NAT64/DNS64 service at the TERENA Networking Conference (TNC2010) last year, and it has been running ever since. The main feature of NAT64/DNS64 is that it can not only be used as a usual NAT, but as a meeting point between two networks. The service is open to anyone wishing to try an IPv6-only setup (subject to the compliance with our acceptable use policy).
Figure 1: NAT64/DNS64
To start using this service, you simply need to point your primary resolver to a DNS64 server address.
LITNET and Kaunas University of Technology have started a public NAT64/DNS64 service over a year ago to test the implementation and to see if it is actually useful. So far it has been used mainly for experiments with IPv6-only host accessing IPv4 networks, but the usage scenarios are not limited to this. It may be the ultimate tool that will enable silent and smooth transition to IPv6 without dual-stack. In the image below you can see traffic statistics as observed on our NAT64 server.
Figure 2: Traffic Statistics observed on our NAT64 server
Detailed information about the service is available at: http://ipv6.lt/nat64_en.php