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The IP address of Ultraprison Minecraft server is play.ultraprison.org
Open the game Minecraft, click "Play" button then choose "Multiplayer" option from the menu. Click "Add Server" tab and input the text play.ultraprison.org on "Server Address" then hit "Done". Once the connection is available and turns green you may click on "Join Server" button to play on Ultraprison.
Ultraprison server supports Minecraft game version: 1.8.8, 1.15.x, you may also use any other older or lower versions to connect and play.
The Ultraprison server is currently hosted in Canada.