The last four digits of the last digit of a bank card are usually different, right? Is it possible that they will be the same?

There are no duplicate numbers in the last four digits of bank cards from the same bank.

Credit cards (credit cards) are unified, usually 16 digits, and American Express cards are 15 digits; debit cards are not unified, usually the minimum is 16 digits, and the most bank cards generally have 16-19 digits. wait.

Generally, bank cards are divided into credit cards and debit cards according to whether they grant the cardholder a credit limit.

Debit cards are divided into transfer cards, special cards and stored-value cards according to different functions. Debit cards cannot be overdrawn. Debit cards have the functions of transferring money, depositing and withdrawing cash, and spending money.

Extended information:

A bank is composed of three parts

1. The first six digits are: Issuer Identification Code (IIN). The first digit is the main industry identifier (MII). For example, cards issued by "China UnionPay" must start with 62; while those who use Visa credit cards in China will start with 4.

2. The middle digits are: personal account identification (starting from the seventh digit). The middle digits are customized by the card issuing bank and generally consist of 6-12 digits. Up to 12 digits can be used.

Each bank has different rules for identifying personal accounts. Some banks will include code information such as branches, sub-branches, and savings outlets in this part of the content. Some banks may not be so detailed and will use natural running sequence codes.

3. The last digit is the check digit: use the Luhn algorithm to calculate the last digit of the credit card or debit card.