Found out what is going on.

https://twitter.com/TheKinrar/status/1676675781290872842

To http://mastodon.xyz users: we’re down, the domain was apparently supended by the .xyz registry. I can’t get in touch with them, or my registrar, before tomorrow so expect a few hours of downtime

Follow up:

Waiting for a reply from .xyz registry, they say max 48h, hoping it will be quicker.