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16-Digit Code Generator with Luhn Algorithm

16-Digit Code Generator

Generates random codes starting with 51 or 55 that are valid according to the Luhn algorithm

Click "Generate Code" to start
Codes generated: 0

📝 Specification

  • Code always starts with 51 or 55
  • 16 digits in total
  • Valid according to the Luhn algorithm (modulus 10)
  • Last digit is the check digit calculated using Luhn algorithm

🔍 How the Luhn Algorithm Works

  • Starting from the rightmost digit (check digit), double every second digit
  • If doubling results in a number greater than 9, subtract 9
  • Sum all the digits
  • The number is valid if the sum modulo 10 equals 0

This tool generates valid test codes. These are not real payment card numbers.

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