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