Comcast plans to announce its service for home gateway users later this month, but company officials released a few details about this service at the North American IPv6 Summit held here this week.

John Brzozowski, chief architect for IPv6 and distinguished engineer with Comcast, said IPv6 service was already available to home gateway users in two U.S. cities. The service is available for residential customers that use one of six home gateways, which are specific IPv6-enabled models from D-Link, Linksys and Netgear that are listed at this .

"When we launch this service in an area, we are instantly seeing IPv6 traffic among home networking users that have IPv6 turned on by default," Brzozowski said.

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Comcast is providing home networking users with what's called dual-stack service, which includes support for native IPv6 as well as the current version of the Internet Protocol, dubbed IPv4.