On Windows, open Command Prompt and type `ipconfig /all`
On Windows, look for the `Physical Address` under your active network adapter
On Windows, open Settings > Network & Internet > Advanced network settings > Hardware and connection properties
On macOS, open System Settings > Network > select your connection > Details > Hardware
On macOS, open Terminal and type `ifconfig` and look for `ether`
On Linux, open Terminal and type `ip link`
On Linux, look for `link/ether` under your network interface
Check the label on the laptop box or device sticker if the MAC address is printed there
Check your router’s connected devices list for the laptop’s MAC address
Use the laptop’s Wi-Fi or Ethernet adapter properties in Device Manager or network settings