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To do so, either click the Windows logo in the bottom-left corner of the screen, or press your computer's ⊞ Win key. You should see the Command Prompt icon, which resembles a black box, pop up at the top of the Start window. Doing so will invoke a drop-down menu. This option will allow you to request information about your computer's network that only an administrator account can view. If you're on a guest, shared, or school account, you won't be able to access the administrator version of Command Prompt. After doing this, Command Prompt will open. This command forces command prompt to display the addresses of all connected networks. Doing so will run the "ipconfig" command. You should see several sections of text appear. You'll find this option under the "Wireless LAN Adapter Wi-Fi" heading. The number listed to the right of this category is the router's IP address. The number should look something like this: 123.456.7.8 Once you have this number, you're ready to proceed with disabling your router's firewall.

Summary:
Open the Start menu. Type cmd into Start. Right-click the Command Prompt icon. Click Run as administrator. Click Yes when prompted. Type ipconfig /all into Command Prompt. Press ↵ Enter. Locate the "Default Gateway" number. Write down your router's IP address.