How to Decode Credit Card Numbers

Summary by Krater

This video breaks down the anatomy of credit card numbers, explaining the Issuer Identification Number, account identifier, and the Luhn algorithm used to generate and check credit card digits.

From the video

Answers: How do credit card numbers work and how are they checked?

• credit card number anatomy
• Issuer Identification Number
• account identifier
• Luhn algorithm
• check digit calculation

What it concludes

• The first 6 to 8 numbers of any card number are the Issuer Identifier Number denoting the institution that issued the card.
• The Luhn algorithm is used to calculate the check digit and filter out most invalid card numbers.
• The Luhn algorithm can catch single-digit typos and the transposition of two adjacent digits.
• Credit card companies in Japan considered adding a 17th digit to newly issued cards due to the risk of running out of numbers.
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