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Diagram illustrating the structure of an Issuer Identification Number (IIN) on a payment card

Credit Card

What is an Issuer Identification Number (IIN)?

Issuer Identification Number (IIN) is the first 6 digits of 16-digit cards and the first 8 digits of 19-digit cards. It is more commonly known as BIN (Bank Identification Number). Learn what the IIN table holds and how to look one up.

Illustration of a payment card numbering structure under the ISO/IEC 7812 standard

Credit Card

What is ISO/IEC 7812?

ISO/IEC 7812 is a standard that primarily describes the card numbering system and the application and registration procedures. Identification cards, in physical or digital form, are an integral part of operations in many industries.

Diagram illustrating the EMV Tag-Length-Value (TLV) data structure used in card transactions

Online & Authorization

What are EMV Tags?

In EMV, data is stored in Tag-Length-Value (TLV) format, and it is carried between the card, the POS terminal, and the authorization system in this same format. This post lists every EMV Tag, its type, and its description.