More and more companies are signing up for the World IPv6 Day, the event dubbed the "test flight" of the new protocol that will upgrade the current Internet.

The latest to announce its participation, according to NetworkWorld, are Comcast and Time Warner Cable, two of the largest Internet Services Providers (ISP) in the United States. They join Google, Facebook, Yahoo!, Akamai, Cisco, Juniper and other industry leaders that have earlier committed to join the day-long IPv6 trial.

Organized by the Internet Society, a non-profit group involved in promoting Internet standards and policies, the World IPv6 Day seeks to motivate organizations across industries – ISPs, hardware makers, operating system vendors and web companies – to prepare their services for IPv6 to ensure a successful transition as IPv4 addresses run out.

The event is set on June 8, 2011 UTC, during which time participants will enable IPv6 on their main websites for 24 hours. To know more about this event and the requirements to join, visit the World IPv6 Day web page here. To read the full NetworkWorld story, click here.