To set up 'AT&T router login', follow the step-by-step instructions below. Connect your PC to your internet service provider first. A wireless network or LAN with stable internet speeds may be used to connect to the internet. The procedure might be hampered by a slow internet connection. Hence, ensure you have a stable and strong signal during the AT&T router setup process.  Type 192.168.1.254 into the IP on the browser address box while connected AT&T router. Look find the secure codes next to "System Password" or "Device Access Code" on a sticker on the back or side of your modem and use them.