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Meanwhile, Comcast has enabled tens of thousands of customers across the country to use its original residential , which was for customers with standalone computers connected directly to cable modems. The standalone computer users that qualify for this service must run an operating system - such as 7, Windows 8 or OS X Lion - that enables IPv6 by default.

Comcast's nationwide launch of stand-alone computer support for IPv6 began last November, and all of these customers are receiving dual-stack support for both IPv6 and IPv4.

Comcast is working towards the goal of having 1% of its 18 million residential subscribers use IPv6 by June 6, 2012, as part of its commitment to . On , more than 1,000 leading Web sites including Facebook, Google and Bing as well as ISPs such as Comcast, Time Warner and AT&T have committed to turn IPv6 on and leave it on for good.

"We're not there yet, but we are tracking to reach 1% by June 6," Brzozowski said.