I'm wondering if is it possible that the same VISA debit card numbers could ever be issued to different people by different banks or companies?
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6this probably isn't dreadfully on topic for this site, however the answer is no. Each issuer has what's known as a BIN number which is the first six digits of the 15/16 digit card number. That BIN is unique to that bank/company, so no other company can use it to issue a card. As such there wouldn't be a circumstance where there's an overlap. – Rory McCune Nov 19 '13 at 14:37
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4This question appears to be off-topic because it is about banking, not security. – AJ Henderson Nov 19 '13 at 14:50
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whilst a card issuer may choose to reuse PAN (long number) to identity a card, a PAN cannot normally be reissued by a different card issuer. The reason for this is because the BIN (first 6 digits) is issued uniquely to a card issuer.
There is one exception: If card issuer is bought by another card issuer (e.g. bank 1 buys bank 2) then card number may be reissued under the new name of the card issuing organisation - but really this is an edge condition and in the spirit of the question the answer is largely no
Note: In the UK, Clydesdale reissued mastercard PANs, but eventually stopped after obvious problems occurred. see: http://www.theguardian.com/money/2003/may/10/creditcards.debt1
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Callum Wilson
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3That is a different scenario that the one the question is about, which is the issuance of a single card number by *different* banks. – Xander Nov 19 '13 at 15:56