Currently these servers are publicly reachable in this domain:
The servers are currently all rented from and hosted by Hetzner Online AG.
They are dedicated servers, meaning that the physical hardware is not shared with other customers.
All servers and services are equally available via IPv4 and IPv6. (Please inform me should you find that is not true.)
All servers run Debian GNU/Linux on the stable release, with selected packages installed from the backports repository.