Get router IP on Mac OS
Using Terminal app
Go to the Launchpad.
Type “Terminal” in the search bar of the Launchpad.
Click on the “Terminal” icon.
When Terminal.app is open, type the following command:netstat -nr | grep default
This will output the following:joe$ netstat -nr | grep default
default 192.168.0.1 UGSc 50 46 en1
In this example 192.168.0.1 is your default gateway (router) IP address.
Using Mac OS User Interface
In the top menu click "Apple" button.
Select "System preferences..." in the menu.
In the "System preferences" window select "Network"
Select your active Network connection in the list on the left. Usually you active connection will be already selected.
Click on Advanced... in the bottom right corner of the window.
Select TCP/IP from the Tabs.
You router IP address is in a Router line.