The credit card number length follows international standards and can range from 13 digits to 19 digits, but most of the credit cards we commonly use are 16 digits, and American Express credit cards are 15 digits. Diners Club is 14 bits.

Generally, cards starting with 6 are UnionPay cards, cards starting with 4 are cards carrying the Visa logo, cards starting with 5 are cards carrying the Master card, and cards starting with 3 are cards carrying the JCB logo. .

The 1-6 digits of the card number are the card issuing bank identification code, which is the familiar BIN code

The 7-15 digits of the card number are the bank account number (except for American Express cards, below) ), its meaning is customized by the card issuing bank, and each bank has different definition standards;

The 16th digit of the card number is the check code.

I would like to remind you that it is best not to tell others your card number casually. With technology now so advanced, there is no telling who may have some of your personal information, and then fraud will occur.