what is a cc checker?

A cc checker, or Credit Card Checker, is a tool used to verify the validity and accuracy of a credit card number. This verification is completed through the use of a mathematical algorithm that calculates the check-digit present in all major credit card numbers. By comparing this check-digit against known valid sequences, CC Checkers are able to identify if the number provided is real, fraudulent or missing information.

CC Checkers are also used to detect errors in inputs when making online purchases as well as by merchants who need to validate the legitimacy of their customers' credit cards. Credit card numbers can be manually input into the CC Checker or obtained through magnetic stripe readers and optical scanners. The outcome can be displayed in a simple pass/fail format, providing insights into how reliable that payment method is for any given transaction.

Furthermore, CC Checkers can also help reduce multiple fraud attempts for vulnerable sites that don't have more sophisticated measures in place. Automated bots often generate thousands of credit card numbers with little difficulty but fail to pass basic checks done by a CC Checker. For example, one famous fraud activity involves testing every possible combination of an individual card number's numbers until they find one that works; while this technique may work occasionally it will definitely fail if checked against this type of verification technique.