The credit card number is a series of numbers printed on the front of the credit card. The card number is generally 16 digits. The current 16-digit credit card number is stipulated by international standards. Generally speaking, the first 6 digits of the card number are BIN, which is assigned by the international card organization. The first digit of the credit card number is 4, which is a VISA card, and 5 represents Master. If it is 622126~622925, it means this is a UnionPay standard card.

The credit card number starting with 6 is China UnionPay single currency card (or American discover), the credit card number starting with 4 is the international brand VISA credit card (the world's number one credit card organization), the number starting with 5 is the international brand MASTERCARD, and the credit card number starting with 3 is Japan's JCB and the United States' AMERICANEXPRESS. 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.

For example, a user's new credit card application was successfully approved, starting with 489592. Then we can accurately determine this person based on what a credit card number is and the rules for determining credit card numbers. The credit card applied for by the user is a VISA Platinum Credit Card.

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