Member Since: August 21, 2013

Country: United Kingdom

  • This is quite a late reponse, but for anyone looking in the future: the data you see is a 10 DIGIT hexadecimal string, BUT only the last 8 digits are the ID. This is because the EM4100/4001 specification states that the RFID Tag has an 8 digit (hex) unique id, and a 2 digit (hex) facility ID. The 10 digits you see represent both the facility ID and the unique ID. One hex byte contains 4 binary bits, so the 8 digit ID is 32 binary bits (8*4).

    TL;DR: The 32bit spec refers only to the last 8 hexadecimal digits of the 10 digit string.

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