To find your router’s WEP key, access the router setup page by typing its IP address in the address bar of a Web browser, logging in, accessing the Wireless Security Settings section and navigating to the WEP field. If common router IP addresses such as 192.168.1.1 or 192.168.2.1 fail to provide access to the setup page, determine the actual IP address by using the ipconfig command in the Command Prompt.
Open a Web browser, type “192.168.1.1” in the address bar and press Enter. When prompted, type the username and password in the appropriate field, or type “admin” in the username filed, and leave the password field empty if you never set up the login credentials. Once the router setup page opens, look for a list of options on the left side or on the top of the page, depending on your router’s brand and model, find the option regarding wireless security, and write down the WEP key that is currently enabled.
If you can’t access the router setup page, open the Run dialog box by pressing R while holding down the Windows key, type “cmd” and click OK. Once the Command Prompt appears, type “ipconfig”, press Enter and copy the IP address listed as the Default Gateway into the Web browser’s address bar. As of 2015, more advanced wireless key systems, such as WPA and WPA 2, have superseded WEP due to its design flaws that allowed attackers to breach protected networks easily.