The bank card number is composed of numbers, so the first digit of the bank card number should be the number 6, not b. The bank card number refers to the number code on the hard card issued by each bank. There are unified regulations on the business number segments among various commercial banks. The first 6 digits of the card number represent the card issuing bank identification code, also called the BIN number. Different BIN numbers represent different bank card organizations and card levels.

Currently, domestic bank cards are divided into different bank card organizations according to the number at the beginning of the number. Among them, bank cards starting with the 4-digit BIN number belong to the VISA card organization, and those starting with the 5-digit BIN number belong to the MasterCard card organization. Organization, cards starting with 9 and 62 and 60 belong to China UnionPay, and UnionPay cards starting with 62 and 60 are UnionPay standard cards that comply with international standards and can be used abroad. They are also the main bank cards issued by China UnionPay in recent years.

Extended information:

In 2000, in order to promote the universal work of the Internet, the People's Bank of China organized and formulated a series of bank card business specifications and technical standards. Among them, the "Bank Card Issuing Bank Identification Code and Card Number" stipulates that all RMB cards issued and used in China must use a 9-prefix BIN. However, the BIN range of UnionPay standard cards currently issued by China UnionPay member institutions is: 622126~622925, all prefixed with "62", so it is also called UnionPay standard card prefixed with "62". In 2007, UnionPay applied for 7,002 new card BIN numbers starting with 62, 1 card BIN number of 638888 and 1 card BIN number of 685800.

Baidu Encyclopedia - Bank Card Number