The default username and password for Arris routers are "admin" and "password" respectively. ARRIS recommends that you change the default username and password on their router after logging in for your very first time. Think of the default password to Arris as a code that lets you into your house. Although it works perfectly fine, this safety measure will protect you from unwanted visitors who might want to steal things or vandalize property inside. To prevent any harm coming up on your router and WiFi network, change the name right away!