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The IP address of Cals server Minecraft server is cals.ml
Open the game Minecraft, click "Play" button then choose "Multiplayer" option from the menu. Click "Add Server" tab and input the text cals.ml on "Server Address" then hit "Done". Once the connection is available and turns green you may click on "Join Server" button to play on Cals server.
Cals server server supports Minecraft game version: 1.15.2, you may also use any other older or lower versions to connect and play.