Google search is now available over IPv6 at ipv6.google.com (you'll need an IPv6 connection to view it). While IPv4 provides about four billion IP addresses — not enough to assign one to every one of Earth's more than six billion inhabitants — IPv6 provides enough address space to assign almost three billion networks to every person on the planet. By allowing every computer and mobile device on the network to talk to each other directly — an idea known as the "end-to-end principle" that was crucial to the original design of the Internet — IPv6 will allow the continued growth of the Internet and enable new applications yet to be invented.
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