Hmm. I suspect you may be talking about the micro level validity. My range
checking says 4000 - 4999 belong to Visa. You may be getting down to the
level that 4001-4002 belong to The First National Bank of America and
4004-4010 belong to Big Bank Inc but that 4003 doesn't belong to anyone so
it's not valid. Am I catching your drift?
Yes, though at this point, I'm not aware of unassigned blocks.
(Do you see cards with more numbers in our future??)
I'll ask my contacts.
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