Web giants promote new IPv6 internet address system
Google, Yahoo, Microsoft Bing and Facebook are among the companies switching-on IPv6 versions of their websites for the one day trial.
The technology is gradually being introduced because the world is running out of older IPv4 addresses as more devices come online.
Companies and home users may need new networking equipment. However the transition is likely to take years.
World IPv6 day is partly a technical exercise by internet companies to see how the technology works, and partly an awareness-raising initiative
For the small percentage of users already set up to access IPv6, they will be able to connect through the usual URLs - such as Google.com or Yahoo.com.
Behind the scenes, their browsers will be pointed to the new, much longer IP address.
http://www.bbc.co.uk/news/technology-13685772