From #openttdcoop wiki
Our community #openttdcoop consists of three servers.
All persons with administrative rights should have a closer look to the Server Administration Guide
Feel free to watch us playing: search for the server name "#openttdcoop". There is no password needed to join as a watching client. Playing access (company password) is granted to all our members, see Membership for further details.
rcon on the Member Zone is granted to every member of #openttdcoop.
This server is now replaced by the ProZone.
If you heard of #openttdcoop and would like to make the first steps toward a membership in our community, simply read what you have to do at Membership and Public_Server. Feel free to join our community and play on our Public_Server.
rcon on The Public Server is granted to every member of #openttdcoop.
Current configuration on this server: Public_Server_openttd.cfg
Needed for our latest gametype, this server runs a nightly version of OpenTTD and is used for Coopetition Games only.
rcon to this server has every member of #openttdcoop and is passed on to teams in need of a server.
Sometimes, we need a server for testing various patches and settings in order to support ongoing development or simply to prepare for upcoming games.
rcon on this Server is granted to every member of #openttdcoop.