Answer:
The answer is a function of the rules of the card association that you are affiliated with for the issuance of the cards. If they are Visa debit cards, you will have to look to Visa's operating rules and/or your Visa contract to determine if Visa requires the use of a separate BIN. The same would be true with respect to MasterCard debit cards.
First published on BankersOnline.com 2/02/09