IIN

IIN, or the Issuer Identification Number, is the first six digits of a credit or debit card number. It uniquely identifies the financial institution that issued the card. When a transaction occurs, the IIN helps banks and payment processors quickly determine the card's origin, ensuring secure and accurate processing. Think of it as a bank's digital fingerprint embedded at the start of the card number, enabling efficient identification without revealing sensitive account details. This system supports the seamless flow of electronic payments across different banks and networks worldwide.