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    Question DL barcode number structure?

    Really OFF-topic, nothing to do with Macs, but with hacking:

    I'm trying to figure out what the number encoded in the barcode on the back of a California drivers license means. It's a code-128 barcode and here is the data from two DLs:

    11ss130aaxxxxxxxx
    expire 06/06/2011
    born 06/06/1975

    11ss356aaxxxxxxx
    expire 05/10/2015
    born 05/10/1979

    The bold number is the decoded barcode. It's all digits, I just replaced some that I already figured out for this legend:
    - last 7 digits (x) are the drivers license number.
    - aa is the leading letter of the DL number as number of the letter in the alphabet (01=A, 02=B, etc.).
    - ss is the year the license was issued.

    The 11 in the beginning is the same in the few licenses I've seen, but that could be a coincidence. And what about the remaining three digits? Does anyone see a relationship to the birth or expiration dates? Any other ideas?

    Bonus: On front of the card, behind the issue date on bottom is a code like this:
    ddd cc FD/xx
    - ddd digits only. I'm pretty sure it's a code for the DMV where the license was issued.
    - cc two characters, letters or digits. It's not a hex number as I've seen letters >F.
    - FD/ appears verbatim in the licenses I've seen.
    - xx is the expiration year
    Does anyone know more about this code, esp. ddd and cc and whether there's ever anything other than "FD/"?
    Last edited by envision; 11-23-2010 at 08:48 PM.



 

 

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