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I suspect there is some kind of checksum built into the cardnr.

To wrap up our cleavage discussion, let’s assess the of messages the cleavage-showers are getting.Note, this does not check to see if the numbers are in-use by someone.A checksum or hash sum is a fixed-size datum computed from an arbitrary block of digital data for the purpose of detecting accidental errors that may have been introduced during its transmission or storage.A counterfeiter familiar with the Luhn algorithm, however, could get past this particular hurdle.Verifying a 16-digit card number starts by taking the first 15 digits, which are the institution code and the individual account identifier.

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