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To be completely clear and spell this out, these fake credit card numbers should not be used to try and purchase stuff.
You can also generate valid credit card numbers for specific Issuing Networks by utilising their particular prefixes.
This formula has been in use to validate a lot of identification numbers besides credit cards since its development by scientist Hans Peter Luhn from IBM.
To teach you how to manually validate a specific number, lets do an example: Say we have In order for a credit card number to be valid, it has to be validated by the MOD 10 algorithm.
A valid credit card number has several fields and each of them has a meaning.
For the technically inclined, this number complies to the ISO 7812 numbering standard.