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Credit Card Validator

Check a card number's Luhn checksum and identify its likely card network from the number pattern.

Guide

Interactive workspace

No account required
Credit Card Validator
Luhn checksum
Valid
Digit count
16
Likely network
Visa

Card detail (BIN / IIN)

BIN / IIN (first 8 digits)
41111111

The issuer identification number. Which bank issued a card is held in commercial BIN databases, so this tool reports the network and industry rather than the bank.

Major industry identifier (first digit 4)
Banking and financial
Expected length
13, 16, 19 digits for Visa
Checks
Luhn checksum: ✓ PassLength: ✓ Matches networkPrefix: ✓ Visa range
Major industry identifier (MII) table: 0–9
First digitIndustry
0ISO/TC 68 and other industry assignments
1Airlines
2Airlines and other industry assignments
3Travel and entertainment
4Banking and financial
5Banking and financial
6Merchandising and banking
7Petroleum
8Healthcare and telecommunications
9National assignment

Expiry and security code (optional, format only)

Format checks only — a valid format does not mean the card exists or can be charged.

Test numbers

Published gateway test numbers — click one to fill the validator.

Bulk validation

One card per line. Add expiry and security code when you have them, separated by | — for example 4111 1111 1111 1111 | 12 | 29 | 123. Numbers are shown masked to the last four digits.

This local check validates only the pattern and checksum, not an account or payment authorization. Use published test numbers, never real card data. Optional analytics and advertising have separate consent and privacy disclosures.

How to use it

  1. Use a documented synthetic test number, not a real card.
  2. Read the Luhn checksum, digit count, and likely network.
  3. Test any payment integration through the payment processor's authorized sandbox instead.
What is Credit Card Validator?

Check a card number's Luhn checksum and identify its likely card network from the number pattern.

How it works

SiteIndex runs the Luhn checksum algorithm against the digits you enter and matches the leading digits and length against known card network patterns.

Common uses
  • Verify a test card number passes the Luhn checksum before using it in a sandbox.
  • Confirm which network a card number pattern likely belongs to.
  • Catch a mistyped card number during manual data entry.
Limitations
  • No bank is contacted. A passing checksum cannot establish issuance, ownership, available funds, expiry, or payment authorization.
  • Non-digit characters are stripped, so inspect the digit count as well as the checksum.
Frequently asked questions
Is this a real payment check?
No. This only validates the checksum and number pattern; it does not verify that a card is active, funded, or genuine. No card data is sent anywhere.

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