Punishment: Temporary or Permanent Ban.
No big-name server allows this. It hurts the server and can lead players to potentially dangerous places.
* Posting an IP or server site through any on-server means (signs, books, /msg, chat, etc) is punishable with a permban.
* Attempting to sell your Minecraft Account on the server is punishable with a ban. -associate can be punishable with a mute.