The 16-digit credit card number is an international standard, and the first 6 digits are BIN, which is allocated by the international card organization.

the first card number of a credit card is 4, and 5 is Master. 622126~622925 are UnionPay standard cards. 6 starts with China UnionPay single currency card (or American discover), credit card number 4 starts with international brand VISA credit card (the world's first credit card organization), 5 starts with international brand MASTERCARD, and 3 starts with Japanese JCB and AMERICAN EXPRESS. The 7th-15th rows are allocated according to their own needs, and the 16th is the parity bit.

other non-16-digit card numbers are assigned by banks themselves. The credit card number is a protruding 16-digit number on the front, which is located below 1/3 of the card. Below the card number is the period of validity separated by the "/"symbol, and at the bottom is the cardholder's name.

Extended information:

Generally, a credit card is a special plastic card with a length of 85.6mm, a width of 53.98mm and a thickness of 1mm. The name of the card issuer, expiration date, number and cardholder's name are printed on the front, and there are chips, magnetic strips and signature strips on the back. Cardholders can use their credit cards to shop, spend money and deposit and withdraw cash from banks.

credit card consumption is a non-cash transaction payment method, and it is not necessary to pay cash when spending, and the repayment will be made on the Billing Date.

Credit cards are divided into credit cards and quasi-credit cards. Credit cards refer to credit cards with a certain credit limit within which the cardholder can spend first and then repay. Quasi-credit card refers to a quasi-credit card in which the cardholder deposits a certain amount of reserve fund as required, and when the balance of the reserve fund account is insufficient to pay, it can be overdrawn within the specified credit limit. The credit card generally refers to a credit card.