On Windows, open Command Prompt and type `ipconfig`
On Windows, open Settings > Network & Internet > Wi-Fi or Ethernet > Properties
On Windows, go to Control Panel > Network and Sharing Center > Change adapter settings
On Mac, go to System Settings > Network
On Mac, open Terminal and type `ifconfig`
On Mac, hold Option and click the Wi-Fi icon in the menu bar
On Linux, open Terminal and type `ip addr`
On Linux, open Terminal and type `ifconfig`
On Linux, check your network settings in the system menu
To find your public IP address, search `what is my IP` in a browser
To find your public IP address, visit a site like `whatismyip.com`