This is an interesting question... I'm not so sure of the answer however...
I've looked at the cards I've issued and the associated card numbers. Based on what I have seen, I can't see how the last 6 digits can be a cert number. Isolating those in particular, they appear to be very random. Agreed that the first 6 are the same, but as for the rest of the numbers/letters, I can't determine a rational for what they may mean or which are associated with what.... students with specialities have, as far as I can tell, no similarities regarding the digits displayed on the different cards...
Thanks for the question... now I will have to see if I can find out... :confused4: