toolsko

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Card Number Rules by Network

Prefixes (IIN ranges), lengths and security-code size for every major card network.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Reference for building card forms and validation.

How to use it (step by step)

  1. 1No typing needed: the information is shown below.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

BIN / IIN
The first 6–8 digits of a card. They tell which network (Visa, Mastercard…) and which bank issued it, like an area code on a phone number.
Page range
A way to choose pages: 1-3 means pages 1 to 3; 5 means only page 5; 7- means page 7 to the end.

More in Cards & Payments

Credit Card Minimum Payment CalculatorSee how long paying only the minimum takes, and the total interest, versus a fixed payment.APR ↔ Monthly Rate ConverterConvert a credit card APR to monthly and daily rates and effective annual rate, or back.Balance Transfer CalculatorIs a balance transfer worth it? Compare interest + transfer fee against staying on your card.Credit Card Cash Advance Cost CalculatorTrue cost of a cash advance: fee plus interest from day one.Foreign Transaction Fee CalculatorWhat a purchase abroad or in a foreign currency really costs after conversion and card fees.Credit Utilization CalculatorYour credit utilization ratio overall and per card, plus how much to pay to reach a target.