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It is used to validate the primary account number to protect against accidental errors.
To be completely clear and spell this out, these fake credit card numbers should not be used to try and purchase stuff.
They merely respect guidelines of a valid credit card number.
An contains a six-digit issuer identification number (IIN), an individual account identification number, and a single digit checksum.
The first digit of the issuer identification number is the major industry identifier (MII).