Adtran Default Password

Accessing your router with the Adtran default password is the first step to configuring network settings. Connect to the device, open a browser, and enter its default IP address. Use the factory username and password found on the router label or manual. Once logged in, change the default credentials to secure your network and prevent unauthorised access.

https://adtranrouter.com/how-to-change-adtran-default-password-to-ensure-security/