In Three Years, the Internet Hits a Brick Wall
Unfortunately, neither IPv4 or IPv6 are incompatible, which means that any IPv4 device will have to be assigned an IPv6 number. IPv4 to IPv6 connections will either have to be translated or tunneled, like a VPN connection, via a router.
And that means that the IPv4-to-IPv6 transition will likely be anything but simple. "The response that the global Internet industry will undertake an overnight transition to use IPv6 is perhaps at one somewhat improbable end of a rather broad spectrum of possibilities here, if only from the consideration of the implausibility of such timing in a network of tis [sic] size," Huston wrote.
However, the transition will likely be easier for some countries than others. According to OECD data collected in March, Germany, Japan, France, and Australia lead in terms of the number of IPv6 domains actually deployed; the United States is thirteenth, with 0.62 percent of the overall domains. Japan already has several IPv6 networks already deployed. About half of the top-level domains are IPv6 enabled.
