IPv6 Day
Google, Facebook, Yahoo! and a host of other organizations world wide will be doing a 24 hour test on June 8th of IPv6. This is sponsored by the Internet Society and is intended to prepare for the adoption of a new Internet Protocol. This is in response to address exhaustion of the IPv4 addresses and the continued growth of the open internet.
You probably won’t even notice the test, 99.95% of people will have no problem accessing services. Either they will connect over the IPv6 or their system will fall back to IPv4. There’s always a possibility that systems will fail, if you find participating websites running slowly or unresponsive this may be due to misconfigured or misbehaving home networking equipment. Routers and other home equipment can make a computer think it has IPv6 connectivity when in fact it’s not working.
If you would like to read more about it and see which organizations are participating check out the Internet Society’s World IPv6 day page.