Moreover, it seems that even within the serial number ranges that are supposedly guaranteed to be unique by manufacturers there appear counterfeit tag products that have duplicate serial numbers (see this question on duplicate serial numbers of counterfeit(?) NTAG203 chips). ![]() Still there will often be significant similarities between serial numbers of each batch (e.g. So these serial numbers are often unique (each manufacturer has a block of trillions of serial numbers). Within that block many manufacturers (I'm not sure about all of them) guarantee that they use each serial number only once. NXP serial numbers start with 0x04, Infineon with 0x05, etc). ISO 14443 Type A tags with 7 byte serial number (similarly for serial numbers of ISO 15693 tags): Each manufacturer is allocated a block of serial numbers (e.g. ![]() ISO 14443 Type A tags with 4 byte serial numbers: There certainly exist duplicates (mainly because there is no clear scheme to divide the available range of serial numbers among the various manufacturers) and you can expect that within a batch of tags, there will be significant similarity between serial numbers (e.g.That depends on the tag product and what you consider truely unique. Are serial numbers of NFC tags truely unique?
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