This tool helps users validate credit card numbers using the Luhn Algorithm, ensuring the integrity and correctness of the input numbers.
Source and Methodology
All calculations are strictly based on the Luhn Algorithm, a widely accepted standard for credit card number validation.
Tutti i calcoli si basano rigorosamente sulle formule e sui dati forniti da questa fonte.
The Formula Explained
The Luhn Algorithm validates a number using the following steps:
1. Reverse the order of the digits.
2. Double every second digit, subtracting 9 if greater than 9.
3. Sum all the digits.
4. If the total modulo 10 is equal to 0, the number is valid.
Glossary of Terms
- Credit Card Number: A sequence of digits used to identify a specific credit card.
- Luhn Algorithm: A simple checksum formula used to validate a variety of identification numbers.
How It Works: A Step-by-Step Example
Consider the credit card number 4539 1488 0343 6467:
- Reverse: 7646 3430 8841 9354
- Double every second digit: 7, 12, 6, 12, 3, 8, 8, 0, 8, 16, 4, 1, 9, 6, 5, 8
- Subtract 9 from numbers over 9: 7, 3, 6, 3, 3, 8, 8, 0, 8, 7, 4, 1, 9, 6, 5, 8
- Sum: 70
- Since 70 modulo 10 is 0, the number is valid.
Frequently Asked Questions (FAQ)
What is the Luhn Algorithm?
The Luhn Algorithm is a simple checksum formula used to validate identification numbers like credit card numbers.
How accurate is the Luhn Algorithm?
It is a reliable method for validating credit card numbers, but it does not verify the account's active status.
Can I validate other numbers with this tool?
Yes, the Luhn Algorithm can also validate other identification numbers that use this checksum method.
Does validation mean a card is active?
No, validation only confirms a number's format, not the card's active status.
How does this tool handle spaces?
The tool automatically removes spaces to ensure correct validation.