DISCLAIMER: Potterworld or Droobledore LLC is not in any way affiliated with Mojang AB, J.K. Rowling, Warner Brothers or any company, copyright or trademark.
As luckiestblock said above, you will need to join our server on a Premium Java account on the IP "play.potterworldmc.com", and we support versions 1.10 - 1.13, the recommended version is 1.12.2.