Hey. What will that mean exactly? DNS is through Cloudflare using their magical CNAME pointer. Can you access OK?

I see IPv4 A records. I am guessing what's happening is that when you look up the DNS over IPv6, it gives you AAAA records instead of A records. Or, it can depend on locality. Cloudflare is not a DNS provider that gives the same answer to everyone -- its goal is to direct traffic to the cache that's closest to the end user.

Edit: I looked into it more and I can get IPv6 and IPv4 DNS servers to serve me both A and AAAA records. The site is now down, however :)

Thanks for checking. Much appreciated.

Yeah I banked too much on Cloudflare... I've ramped up its dyno a bit now too. Hopefully that'll keep it up!

At the time, the non-www subdomain only had IPv6 and I'm not running dual stack. They now look identical.

It meant that anyone not using IPv6 or a dual stack provider wouldn't be able to view the site through the non-www domain. However, they look identical now, so you're good.