Open Command Prompt or Terminal
Type `ipconfig` on Windows or `ifconfig` / `ip addr` on Linux and macOS
Look for the WiFi adapter section
Find the line labeled `IPv4 Address` or `inet`
Use that value as your WiFi IP address
On a phone, open WiFi settings and tap the connected network
Check the network details for the IP address
On a router, log in to the admin page and check the connected device list
Use an online IP lookup site to find your public IP address