a.auth-ns.sonic.net and b.auth-ns.sonic.net are now fully IPv6 enabled for answering authoritative DNS requests over IPv6. While IPv6 is still a long way off from widespread deployment we are seeing more and more services becoming available via IPv6.
Sonic.net has provided IPv6 tunnel services to all broadband connected customers since April of 2003. For more information check out http://sonic.net/features/ipv6 or head straight to our membertools to setup your tunnel today.