On Windows, open Command Prompt and type `ipconfig`
On Mac, open Terminal and type `ifconfig` or check System Settings > Network
On Linux, open Terminal and type `ip addr` or `ifconfig`
On iPhone, go to Settings > Wi-Fi > tap the connected network
On Android, go to Settings > Network & Internet > Wi-Fi > tap the connected network
To check your public IP address, search “what is my IP” in a web browser
To check a website’s IP address, use `ping domain.com` or `nslookup domain.com` in Command Prompt or Terminal