One Percent of Internet May Be Using IPv6
Currently, IPv6 reach for the top 1 million Web sites is only about a sixth of a percent.
One metric that could tell us how much traction IPv6 is gaining is to observe is the global routing table. As noted in this Ars Technica story, currently,the number of BGP-capable networks that are sending out an IPv6 announcement totals 34,214 for IPv4 and 2,090 for IPv6.
"The number of BGP-capable networks that are sending out an IPv6 announcement is a more useful measure, and this totals 34,214 for IPv4 and 2,090 for IPv6. So 6.1 percent of all networks have IPv6 enabled in their routers. This metric is expected to reach 80 percent by 2017 if current trends continue.
"Transit networksISPs that in turn have ISPs or other BGP-capable networks as their customershave relatively high IPv6 deployment: 22 percent.