Model Username Password
Gigaset (most models) admin admin
Some Gigaset models admin (blank)

Change the default password after logging in

Default credentials for Siemens routers are publicly documented, so if your router still uses one, change the admin password immediately to a strong, unique password. Leaving the default in place lets anyone on your network reconfigure the router. Many newer Siemens models instead ship with a unique password printed on the device label - if yours does, use that.

How to log in to your Siemens router

Open a browser and go to http://192.168.1.1, then sign in with the credentials above. For a step-by-step walkthrough, see how to log in to 192.168.1.1. If you don't know a changed password, you can reset the router to restore the default.