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Reply to How to identify whether a passkey is created from an Apple device (iCloud Keychain)
This community driven site https://github.com/passkeydeveloper/passkey-authenticator-aaguids/tree/main may provide some hint on source of a passkey if it is followed by passkeys provider. As it stated in README, It is a community-driven list of known passkey provider AAGUIDs to assist with naming passkeys in end user passkey management interfaces (e.g. account settings). it is purely for UX, This does not replace FIDO's Metadata Service (MDS), which should continue to be used for all authoritative security details about FIDO authenticators. Some AAGUIDs in this list may not appear in FIDO MDS.
Oct ’23