"We're proud to make YouTube available over IPv6 and to begin streaming videos from a select number of sites worldwide to our Google over IPv6 partners," wrote Lorenzo Colitti, a Google network engineer. "With YouTube on board, we now have a significant amount of content delivered on IPv6 and a real audience/traffic for it."

Earlier in the week, ISPs guessed that YouTube had begun production-level support for IPv6 because they saw a leaving YouTube's data centers worldwide.

In his blog post, Colitti said support of IPv6 was necessary to allow more people and devices to attach directly to the Internet.

IPv6 is "a win for openness and new applications because any device can connect to any other device on the Internet," Colitti wrote. "It's even a win for security, because it's harder for hackers to find your computer and attack it."