[malmeloo]

The short answer is that it doesn't. The iCloud website only shows devices that are actively uploading their location to Apple, such as iPhones and iPads. AirTags are not shown there, as they use the FindMy network instead (the whole other-devices-find-your-airtags mechanism). This library focuses on the latter.

Apple devices can query your AirTag's location because they sync its shared secrets through the iCloud keychain, which is used to generate temporary keys that can be use to download and decrypt the tag's location.

[meindnoch]

>Apple devices can query your AirTag's location because they sync its shared secrets through the iCloud keychain

I see. But can't Apple simply read this data from my iCloud keychain? Or is this kind of data sharing through iCloud keychain e2e encrypted?

[malmeloo]

As far as I understand, the keychain is indeed e2e encrypted and it requires at least one of your other devices to be online in order to sync. However last time I checked Apple still fails the mud puddle test, so there does have to be some kind of master key that decrypts the data in the case of account recovery.