How to Find Your Router’s Default Gateway IP Address?

It’s necessary to know your router’s LAN IP address. When you first bought your router, you visited this IP address to configure your router. It should look something like http://192.168.1.1 depending on the type of router. You can find your internal IP address using the following steps:

Windows
Open Command Prompt and type the following command:
ipconfig | findstr /i "Gateway"

You should see something like this:
C:\Documents and Settings\administrator>ipconfig | findstr /i "Gateway"
Default Gateway . . . . . . . . . : 192.168.1.1

Linux:
Open a Terminal and type the following command:
ip route | grep default

Your output will be something like this:
joe$ ip route | grep default
default via 192.168.1.1 dev eth0 proto static

Mac OS X:
Open the Terminal.app and type the following command:
netstat -nr | grep default

You will see something like this:
joe$ netstat -nr | grep default
default 192.168.1.1 UGSc 50 46 en1

All the above examples show that the default gateway IP address is 192.168.1.1.