Google maintains a page showing the percentage of visitors to their site that connect using IPv6:

Google maintains a page showing the percentage of visitors to their site that connect using IPv6:
This document provides an overview of IPv6 security that is specifically aimed at IPv4 engineers and operators. Rather than...
Executive Summary The Internet Society recognises that global deployment of the IPv6 protocol is paramount to accommodate the present...
IPv6 deployment continues to increase around the world. In the six years since World IPv6 Launch levels...