Server IP: play.ratanarchy.com
Rat Anarchy is a new anarchy server for players who just do whatever. It's a fresh map with a huge world border, no anti-cheat, dupes enabled, and nether roof travel allowed, so you can get out there and play how you want.
Basic stuff like /tpa and /home is enabled too, so it's still easy to move around and meet up even with the chaos. The idea is simple: never reset the world and let it go for as long as possible.
Rules are minimal and nearly everything is permitted. Join early, break spawn, build highways, make a group, hide a base, or just see what happens.
It's hosted on solid hardware and the server is built to stay up long term, so if you want a raw anarchy world with very few limits, this is the kind of place to jump into.