Google officially announced that on June 8 2011 , they will test out worldwide the new IPv6 protocol. They state that the IPv6 is the future of the internet , and the IPv4 that currently we all use , is kinda out dated. Facebook , Yahoo , Bing , and all major websites will switch to IPv6 for 24 hours on 8 June 2011. It's the IPv6's day , a day of innovation.

You can test if your connection supports IPv6 here : http://ipv6test.google.com/

Or read more here : http://www.google.com/support/websearch/bin/answer.py?hl=en&topic=8995&answer=1299266