<![endif] CloudFlare Blog home How it works Support Login Sign up Published on June 05, 2014 04:00PM by Matthew Prince . Tweet Today is June 6. For the last two years, the date has been celebrated as World IPv6 Day. CloudFlare has offered full IPv6 support as well as our IPv6-to-IPv4 gateway since 2012. In preparation for this year's IPv6 Day, we scanned the world's largest websites in order to figure out how many are available over IPv6. There's good news and bad news. The good news is that our IPv6 gateway is being widely used in order to enable the IPv6 Web. In fact, of the sites that support IPv6, more than 20% of them do so via CloudFlare. The bad news is that, while CloudFlare, Google, Facebook and other big guys have shown IPv6 can be adopted without a performance penalty, still only 7% of the world's largest websites are available over IPv6. And, disappo...