DAVx⁵
web.de is a German Internet portal which also provides an email service, address books and calendars.
CalDAV/CardDAV setup
If you only want to sync contacts choose "Login with email address" and enter your web.de email address and app-password (see below).
The password must be an app-specific password. Please generate an app-specific password and use this instead of your normal password. Once the password is displayed, copy it and use this one in DAVx5.
Contact group method: No CardDAV contact group support. Choose "per-contact categories" as contact group method to minimize problems.
Important: After you used this password once it will no longer work. You need to generate a new one afterwards (for example if you want to sync calendars, too).
With web.de you must use two seperate accounts for CardDAV and CalDAV
Use “Login with URL and username” and create a connection for the service you want to use.
For CalDAV, use this base URL: https://caldav.web.de
For CardDAV, use this base URL: https://carddav.web.de
User name: your (web.de) email address
Password: an app-specific password must be used in any case (see above).
Contact group method: vCard contact groups are not supported. Choose the method used by your other clients or "per-contact categories" to minimize potential problems.
WebDAV setup
You can access your "web.de Online-Speicher" using the DAVx⁵ WebDAV mounts feature.
WebDAV URL: https://webdav.smartdrive.web.de
User name: your email address
Password: your password or your generated app password for Files/WebDAV (when app passwords are active for your account)
Hint: Videos can't be directly streamed due to a limitation of the server