gyptazy.ch is a Fediverse instance that uses the ActivityPub protocol. In other words, users at this host can communicate with people that use software like Mastodon, Pleroma, Friendica, etc. all around the world.
This server runs the snac software and there is no automatic sign-up process.
Sure, technically everything works fine on operating systems like #FreeBSD, #OpenBSD, #Debian, #Fedora etc. and all my monitoring, backup and admin infrastructure is #IPv6 only for years. But dealing with clients is something different. I think most clients already support #DualStack, especially within my circle but it could still be annoying for people that are forced to use #IPv4 only.