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

The first number of the credit card number is 4, which is VISA card, and 5 is Master. 622126~622925 are UnionPay standard cards. Credit card numbers starting with 6 are China UnionPay single currency cards (or American Discover), credit card numbers starting with 4 are international brand VISA credit cards (the world's number one credit card organization), 5 are international brands MASTERCARD, and 3 are Japan JCB and American AMERICAN EXPRESS. The 7th to 15th digits are assigned to each row according to their own needs according to their regional affiliation, and the 16th digit is the check digit.

Other non-16-digit card numbers are formulated and assigned by each bank. The credit card number is a raised 16-digit number on the front, located on the lower 1/3 of the card. Below the card number is the expiration date separated by year and month with a "/" symbol, and at the bottom is the cardholder's name.

Extended information:

A credit card is generally a special carrier plastic card with a length of 85.60 mm, a width of 53.98 mm, and a thickness of 1 mm. The name of the card issuer, validity period, number, and card holding number are printed on the front. The cardholder's name and other contents are included on the back with a chip, magnetic strip, and signature strip. Cardholders can use their credit cards to shop and spend money with special entities and deposit and withdraw cash from banks.

Credit card consumption is a non-cash transaction payment method. There is no need to pay cash when consumption, and 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 in which the cardholder has a certain credit limit and can consume within the credit limit and then repay; quasi-credit card It refers to a quasi-credit card in which the cardholder deposits a certain amount of reserve fund as required. When the reserve account balance is insufficient to pay, the cardholder can overdraw within the specified credit limit. The so-called credit card generally refers to a credit card only.