Why does your computer show a different IP address in ipconfig? The IP address shown on the What Is My IP home page is your public IP address also referred to as your external IP.
If your internet connection connects straight in to your computer, then your computer is assigned the external IP address. However, if your computer connects to a router then the computer will most likely get an internal IP address like 192.168.1.100 and your router will get the external IP address. Even though the internal IP is a different IP address, it's on the same network and all devices connected will share the same external IP. However, each connected device will have a different IP address from any other internal device. So, from your computer, if you follow the steps in our How to determine if your computer is being assigned the external IP article, you’ll be able to quickly determine your computers IP.