On Saturday, March 31, 2012 06:44:38 AM Adam Tauno Williams wrote: > > We've been running out of IPV4 address and needing to convert someday > > soon for the last 10 years..., but yet the vast majority of broadband > > providers and even most ISP's don't support it yet. > You've got another couple of months. I believe most U.S. network > providers have agreed to a 'flag day' sometime in June 2012. > Internal networks / backbones at Comcast and Verizon have been IPv6 for > some time now. At least that is what a credible little bird told me. Well, since 100.64.0.0/10 got allocated for draft-weil, CGN and NAT444 will be a reality, and IPv4 gets a new lease on its fugue state. (see: http://www.ietf.org/mail-archive/web/ietf-announce/current/msg09959.html ) To Bob's question, IPv6 and IPv4 will coexist as dual-stack until nothing of importance is left on IPv4, and then it will be turned off by network ops, one AS at a time (iterate across ~30,000 AS's). It will likely take decades for IPv4 to go away; but I reserve the right to be wrong.