This is by design: https://en.wikipedia.org/wiki/Bank_card_number | Hacker News

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		onewaystreet on Nov 24, 2015 \| parent \| context \| favorite \| on: MagSpoof – wireless credit card/magstripe spoofer This is by design: https://en.wikipedia.org/wiki/Bank_card_number

mynameisvlad on Nov 25, 2015 [–]

I don't see how this is by design since it only seems to be a vulnerability with Amex and your link doesn't really talk about it.

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