The current 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 4 of the credit card number is a VISA card, and the 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 under 1/3 of the card. Below the card number is the expiration date separated by the year and month with a "/" symbol, and the cardholder's name is at the bottom. As shown below: