In the U.S. the latest numbers for IPv6 are impressive. APNIC’s global survey as of August 1st has IPv6 penetration in the U.S at 1.35 percent. That translates into an estimated IPv6 user base of 3.3 million users, the largest base of IPv6 users in the world.
“There are Tier 1 ISPs out there that refuse to go and get either transit or peering with other ISPs,” Nygren said. “So there are places on the IPv6 Internet, in particular in parts of Europe, where there is no path between point A and B.”