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You must buy your devices through the enterprise store, and then it is automatically linked to DEP.

Any idea why Apple does not provide a service to test whether a device serial number is DEP-managed?

Because once you know the serial number of a DEP device you can enroll into the MDM. There is virtually no security. See https://duo.com/labs/research/mdm-me-maybe

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There is reasonable security. From your link:

> an attacker that obtains such a serial number ... will be able to enroll a device of their own as if it were owned by the organization, as long as it's not currently enrolled in the MDM server.

So, the rule is at-most-once enrollment.

And further down:

> some organizations elect not to require user authentication as part of MDM enrollment.

IOW, if you are not enabling authentication, you have only yourself to blame.

Thanks for the pointer, some good reasons there to avoid DEP.

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