Creative
There's a creative minecraft server on erratic. (Current version 1.18.2)
It can be reached at 10.208.30.188 - this works fine via VPN
On IRC, one can invoke !minecraft to see statistics.
Also on https://space.nurdspace.nl/minecraft statistics can be seen (including a usage heatmap).
External (outside the space), connect your minecraft client to space.nurdspace.nl
Survival
For those who want to play Survival Multiplayer join this IP:
NURDcraft.aternos.me
(Current version: 1.19)