https://devzone.nordicsemi.com/f/nordic-q-a/111059/is-nfc-tagheader0-to-nfc-tagheader3-assured-to-be-unique-for-each-produced-nrfHi, I&#39;m building a solution in which I would like to rely on the uniqueness of the default UID read when doing NFC tag emulation. I would like to know if the default UIDs are actually assured to be unique by Nordic, or just random (and given the addressen-USTelligent Community 13Fri, 10 May 2024 06:58:35 GMThttps://devzone.nordicsemi.com/thread/482713?ContentTypeID=1Fri, 10 May 2024 06:58:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3963109c-c3e2-4845-86ff-91bcb6df2c99Einar Thorsrud<p>Hi,</p> <p>The unique identifiers in the&nbsp;<span>TAGHEADER registers are puplated with random numbers in production (though the nubmers are screened for invalid values per the NFC forum specification). They are not guaranteed to be unique.</span></p><div style="clear:both;"></div>