Sadly, some ISPs have proven to be very reluctant to deploy IPv6 (I'm looking at you, Verizon Fios). We recently switched to Time Warner Cable and got IPv6 working out of the box (
native IPv6 no less), but there's still a lot of inertia from the industry. This is especially serious because
we are almost completely out of IPv4 addresses worldwide! —
bwDraco 15 mins ago