Cloudflare has supported a free IPv4 to IPv6 gateway for IPv6-only web servers since 2011: https://blog.cloudflare.com/introducing-cloudflares-automati...
If you need more than web traffic, you can use our Tunnel service.
If you need more than web traffic, you can use our Tunnel service.
(Now I only have IPv4, so I just use Tunnel).
You get A and AAAA records by default.
Would the earlier product be used for something like a router, which can't run the Tunnel service?