We’ve also taken steps to help support IPv6. On World IPv6 Day, we announced our IPv6 addresses: 2001:4860:4860::8888 and 2001:4860:4860::8844 to supplement our original addresses, 8.8.8.8 and 8.8.4.4.
Google Public DNS’s goal is simple: making the web—really, the whole Internet!—faster for our users. If you’d like to try it yourself, please see our page Using Google Public DNS. For more information, please see our Introduction to Google Public DNS and Frequently Asked Questions.

Fonte: Official Google Blog: Google Public DNS: 70 billion requests a day and counting.