Luhn Algorithm Check
We'll check your number against the Luhn Algorithm to see if it is a valid credit card number.
The credit card number you entered passed the Luhn Check and is therefore a valid credit card number!
The credit card number you entered failed the Luhn Check. It's not valid, did you make a typo?
Major Industry Identifier
The first digit of a credit card number represent the category of entity which issued the card.
Issuer identification number
The first six digits of a card number identify the institution that issued the card to the card holder.
Personal Account Number
Digits 7 to final number minus 1 (the last is the checksum) indicate the individual account identifier.