Internode has become the first Australian broadband provider to make IPv6 (Internet Protocol version 6) available by default for new customers.

One day after completing a successful 24-hour trial of IPv6, Facebook, Google and Yahoo said at a joint press conference that they would begin permanently supporting this upgrade to the Internet's main communications protocol on some of their key websites.

The nation's largest telecom carriers, content providers, hardware suppliers and software vendors will be on the edge of their seats tonight for the start of World IPv6 Day, which is the most-anticipated 24 hours the tech industry has seen since fears of the Y2K bug dominated New Year's Eve in 1999.

A small number of Internet users will experience delays or time-outs as they attempt to visit Facebook, Google, Yahoo and other popular websites tonight and tomorrow, due to a 24-hour trial of a new Internet standard called IPv6.

Developing economies and small ISPs are expected to be hardest hit by an Internet Protocol version 4 (IPv4) address rationing policy enacted this week by the Asia Pacific regional registry.