Luhn Card Pattern Finder & Check Digit Calculator
Combine a card BIN, fixed digits, and X wildcards to find custom number patterns that satisfy the Luhn check.
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Custom card patterns and Luhn validation
Built for preferred card-number patterns, card design choices, and test data. Every calculation stays in your browser and no input is uploaded.
- Combine a card BIN with preferred digits
- Keep the BIN or suffix you already know and write X in each position to search, for example 532932XXX888888.
- Include the check digit in your pattern
- X can appear anywhere, including the final check-digit position. Every complete result shown passes the Luhn check.
- More wildcards create a larger search space
- A pattern with k X positions has 10^k assignments and usually about 10^(k-1) Luhn-valid results. The page generates only your selected limit to stay responsive.
What does a Luhn match prove?
It proves only that the digit structure satisfies the checksum. It does not verify an issuer, an account, availability, or usability.
Luhn only validates number structure. It does not prove that a number exists or has been issued.