Router IP Address on PC and Mac
1) Launch Command Prompt. On Windows 7 and earlier you can do it by selecting Run... from Start menu and typing cmd.exe there. On Window 8 and later you should type "cmd" or "Command Prompt" into Windows search bar.
2) In Command Prompt window type
3) Press Enter and in the output text look for "Default Gateway" line. It will contain IP address of the router.
Alternatively you can type:
ipconfig | findstr /i "Gateway"
This command will only show a line with a router IP address instead of entire network info:
Default Gateway . . . . . . . . . : 192.168.O.1
Mac OS computers
1) Press apple on the main menu.
2) Select System Preferences...
3) Select Network.
4) From the list of connections on the left select active connection.
5) Click on Advanced...
6) Select TCP/IP Tab.
7) You will see a router line with your router IP address in it. It could be either 192.168.O.1, 192.168.1.1 or some other similar address.