There are many ways of finding your routers internal IP address. We will cover a couple of easy methods here.
Step 1: Click the start button
Step 2: In the text box at the bottom of the start menu, type cmd
Step 3: Click on cmd.exe.
Step 4: In the Windows command prompt (the black dialog box with white text) type ipconfig and press Enter
Step 5: You should see a list of results. Look for Default Gateway. This is your router's internal IP address.
To find your external IP address you can visit a website that reports it back to you. We make it easy and do that for you on our site. Below is your current external IP address as of right now:
Your external IP address is: 188.8.131.52
How do we know this? All webservers know your external IP address; it's how they send pages to you when you browse the web. They learn your external IP address when you ask for a page. All we are doing above is sending that number back to you so that you can see it.