What makes a generated card number valid?
A credit card number is structurally valid if it passes two checks: the correct network prefix, and the Luhn algorithm checksum. This generator satisfies both — it uses real IIN/BIN prefixes for each network, and computes the correct check digit using the Luhn algorithm, making the numbers pass any standard card number validator.
Network prefixes used
- Visa — starts with 4, 16 digits total
- Mastercard — starts with 51–55, 16 digits total
- American Express — starts with 34 or 37, 15 digits total
- Discover — starts with 6011 or 65, 16 digits total
- JCB — starts with 3528–3589, 16 digits total
Common developer use cases
- Testing payment form validation and UI flows without real cards
- Seeding test databases with card-like data for financial applications
- Testing Luhn algorithm implementations
- Building card-payment demo environments and mockups
- QA testing of card-number masking and formatting logic
API access
Generate cards via API: GET /api/v1/financial/credit-card?network=visa&count=10
Will these numbers work for real purchases? +
No. Generated numbers pass Luhn checksum validation, but will be declined at any real payment gateway because they are not associated with a real bank account, cardholder, or billing address. Payment networks maintain their own databases of valid card ranges.
What is the Luhn algorithm? +
The Luhn algorithm (mod-10) is a simple checksum formula used to validate credit card numbers, IMEI codes, and other identification numbers. It works by doubling alternate digits from the right, summing all digits, and checking that the total is divisible by 10.
What is an IIN / BIN? +
The IIN (Issuer Identification Number), also called BIN (Bank Identification Number), is the first 6 digits of a credit card number. It identifies the card network and the issuing bank. This generator uses real IIN prefixes from actual card networks, not random numbers.