With reference to the Credit Card number, which digits identify the Credit Card Network?
The Length of the number is from 14 to 19. The first 6 digits are known as the Issuer Identification Number (IIN). Out of them, the first 2 or more digits identify the Card network. For example- The card number that begins with 34, 35, 36 or 37 is an American Express Card; another which begins with 51,52,53,54 or 55 is a MasterCard and the number which becomes with 4 is a Visa card.