alt Hacker News> Actually, we tried that
I'm always fascinated by how many people think IPv6 adoption would have gone lightning-fast if we just used This One Weird Trick, where said trick has actually been tried and didn't help. They usually refuse to back down even after you tell them so.
6to4 or NAT64 isn't the same thing as what all those IPv4+/5/7/8 people want, if that's what you were referring to. You don't actually own the IPv4-mapped-V6 address, as in packets don't get routed to you, they go to a relay that was notoriously flaky.