Minecraft wiki entry for Setting_up_a_LAN_world, associated text: The local IP of the host computer can be found in Windows 10 by opening the command line (press Start, type "cmd" then hit enter), typing the command "ipconfig" and pressing enter, and finding the IPv4. Other operating systems will differ. The local IP should be formatted like 192.168.1.1 or similar, and have 192.168 as the first 2 numbers. When the local IP and port are found, type them into the "Server Address" field (under either Direct Connect or in the Add Server dialogue), formatted like IP:port (e.g. 192.168.1.1:5000) to join the LAN game.