>
>
> Not really that relevant here, but CC numbers seem to be better identified
> by the last 4 or so numbers, as the first ones are bank numbers or
> something the like and often don't change between different CCs, even of
> different owners.


Correct. The first four identify the bank, and there are "ranges" for
different banks or credit card providers. It's not widely discussed, but
it's not all that secret either.

A funny thing happened once, when a certain major provider of mag cards had
been providing test cards with a valid but bogus credit card number (passes
LUHN check) and then visa expanded it's range and issued that card number to
someone...   I think their first statement would have had to be delivered by
truck.
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