Take Lenovo G400 as an example, the computer can check the MAC address as follows:
1. Click the Windows icon in the lower left corner of the computer, enter the "cmd" command in the search box, and press enter to confirm.
2. Then the computer will open the computer's cmd application, enter the command "ipconfig/all" in the cmd application, and press enter to confirm.
3. After entering the command, the computer's network connection information will be displayed, and the item "Ethernet adapter local connection" will be found, in which the option of "physical address" is the MAC address of the notebook computer.