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[projectfortytwo (Chris)]

@Bosaw

cards are XX00X

I think you mean this post.

Collected Thoughts on Card Design (Part 2)

Well, 37 is Amex, I believe that 373732 does exist (quick Google), and all Amex card numbers are grouped 4-6-5 digits. So that’s easy. For the chargecards, it was always the case that digit 12 was the issue number, 13 and 14 were the number of the card on the account, and 15 was the check digit. I worked out 12, 13 and 14 by having multiple users on a chargecard and having a few of my own lost/stolen/compromised. My first platinum card was 100 in digits 12 to 14. After it was lost or stolen t…

I don’t know if the same holds true for newer credit card products but it may do. My accounts date back to 1990 and the current Platinum charge card to about 2001.

When I got my account, BIN 3742 was UK GBP charge cards. 3742 8 was a subset of that for Gold/Platinum within which 3742 88 was Platinum when it was still invitation only and had a similar rarity value to the current Centurion.

I suspect I got my “by invitation only” Platinum card around the time they were trying to persuade some Platinum people to upgrade to Centurion, and were flogging Platinum to existing Gold cardholders. The reason I suspect this is that my Platinum card was 3742 82 (not 3742 88).

Edit: digits 13 and 14 are the number of the card on the account so 00 for the primary card. My supplementary and additional cards are up to 05 now and I can have one more for free. But the business accounts used to allow up to 99 supplementary cards - and after that they’d have run out of digits.