4 ms·
There's already Luhn and a list of valid starting digits...
by ev1 6y ago
There's already Luhn and a list of valid starting digits...
- kelnos 6y agoI think the parent meant "card number that actually is in use and works" when saying "valid", not "follows the rules of card numbers".
- sgjohnson 6y agoYes, which aids the spamming. The first 6 digits of a card number is called the BIN code. That leaves just 9 digits that have to be spammed. The fact that BIN lists are publicly available is reducing the space significantly.