Finding your gateway IP address in Linux, windows and MAC

Original Source: http://wiki.amahi.org/index.php/Find_Your_Gateway_IP

• Windows:
  
  
  • Click Start > All Programs > Accessories > Command Prompt.
    
  • When Command Prompt is open, type the following command: ipconfig | findstr /i "Gateway" (You can copy & paste it in the command prompt; just right-click anywhere in the command prompt window and select Paste.)
    
  • You should see something like this:
    C:\Documents and Settings\administrator>ipconfig | findstr /i "Gateway"
Default Gateway . . . . . . . . . : 192.168.1.1
    
  • In this example, your default gateway (router) IP address is 192.168.1.1.

• Linux:
  
  
  • You'll need to open a Terminal. Depending on your Linux distribution, it can be located in the menu items at the top, or at the bottom of your screen. In this example, we will use Fedora. Click Applications > System Tools > Terminal.
    
  • When terminal is open, type the following command: ip route | grep default
    
  • The output of this should look something like the following:
    joe$ ip route | grep default
default via 192.168.1.1 dev eth0 proto static
    
  • In this example, again, 192.168.1.1 is your default gateway (router) IP address.

• Mac OS X:
  
  
  • Open the Terminal application. Do do this, click Finder > Applications > Utilities > Terminal.app.
    
  • When Terminal.app is open, type the following command: netstat -nr | grep default
    
  • This will output the following:
    joe$ netstat -nr | grep default
default 192.168.1.1 UGSc 50 46 en1
    
  • In this example, again, 192.168.1.1 is your default gateway (router) IP address.