[eNV25]

That's ridiculous. The card number has nothing to do with the account number.

[bombcar]

Sometimes it does, sometimes it doesn't. My debit card from my credit union is easy to map to the account as they share digits, but other debit cards from other institutions are completely unrelated.

[ryandrake]

This whole comment section looks to be turning into a "Falsehoods Programmers Believe About Credit Cards" blog post.

[parl_match]

Yes, that's the problem.