Below are steps required to retrieve router IP address on Mac OS.
  • Click on Apple icon in the left top corner of the screen
  • In the menu click on "System Preferences..."
  • You should see a window with System Preferences pop-up
  • Click on "Network" icon in it. To quickly find this icon you can type its name in Search box
  • Network window should pop up.
  • Select active connection in it. It is marked with green circle
  • Click on "Advanced..."
  • In new Windows which will pop up select TCP/IP tab
  • You should see a screen with data which will have "Router:" entry in it. This is your router IP address

Getting router IP address using terminal app.

  • Click on Launchpad icon in the menu at the bottom of the screen
  • Type Terminal in launchpad or find "Terminal" icon in a Launchpad icon list
  • Click on "Terminal" icon
  • In Terminal window type netstat -nr | grep default
  • You should see a line of text appear. Look for an IP address of your router after "default" word. This is your router IP address