As much as one percent of the Internet is now using IPv6

Currently, there are more than 322,500 IPv4 address ranges announced in BGP, and 2,770 IPv6 address ranges. However, because of the need to conserve IPv4 addresses, ISPs get small IPv4 blocks and frequently have to come back for more. Meanwhile, they can get a single, huge IPv6 block all at once, making this an apples-to-oranges comparison.

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.

via As much as one percent of the Internet is now using IPv6.