December 18, 2025, 9:24 am | Read time: 2 minutes
Fritzbox routers send diagnostic data to the manufacturer Fritz! (formerly AVM). However, many users wonder what information is actually transmitted–and how to disable this function.
Manufacturers of hardware and software regularly collect diagnostic data from users to identify issues early and optimize devices or applications. Often, it is unclear what information the manufacturers collect and how to deactivate the diagnostic function. Routers, which are central devices in home networks, play a significant role in data transmission. Fritzboxes are no exception.
Finding the Fritzbox Diagnostic Function
When setting up a Fritzbox, users can decide whether to keep the diagnostic function enabled. All relevant settings can be made in the router menu. Here’s how:
- Open the browser and enter https://fritz.box/ in the address bar.
- Then log in with the device password.
- Select “Internet” in the menu and then “Access Data.”
- Under the “Fritz! Services” tab, you can view and change the diagnostic settings.
- Under “View Diagnostic Summary,” you can save and view all your transmitted data as a text file.
The transmitted data includes the product ID of the Fritzbox, the software version, and configuration details. However, Wi-Fi names and passwords are not forwarded to Fritz!.
Transmitted Data of the Fritzbox
The Fritzbox transmits information about the firmware version used to Fritz!. This is necessary for the device to recognize and install updates. Diagnostic data helps the manufacturer improve the product by sending error reports. By enabling “Diagnostics and Maintenance,” you allow Fritz! to access the Fritzbox to retrieve selected diagnostic data. This facilitates support when consumers need assistance.
Alternatively, you can create a comprehensive diagnostic report yourself and send it to Fritz! support by logging in with the device password at https://169.254.1.1/support.lua.