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The IP address of Ultracube Minecraft server is ultracube.fr
Open the game Minecraft, click "Play" button then choose "Multiplayer" option from the menu. Click "Add Server" tab and input the text ultracube.fr on "Server Address" then hit "Done". Once the connection is available and turns green you may click on "Join Server" button to play on Ultracube.
Ultracube server supports Minecraft game version: 1.8, you may also use any other older or lower versions to connect and play.
The Ultracube server is currently hosted in France.