How to find out the columns which has 16 digit credit card number

Hi All,
I have a requirement where in i need to find out the columns which has 16 digit credit number in it and create a report with owner, table name and column name.
The issue is that the credit card number can be entered in any columns of any table of any schema. For example the credit card number can be entered in any description field(eg: The number is 4001412134642881), in that case i need to filter only the numbers and do the LUHN check to validate the credit card number.
Please provide me a suggestion on how to scanl the values of all the columns to know the column which has credit card number.
Regards,
Raj.

Tell me this - how the hell do you have a database with credit card number data and NOT know which columns of which tables contain credit card numbers? (and how on earth is this data NOT encrypted!?)
How is what you want to do, NOT a fishing expedition to hack a database that may or may not be storing credit card details?
And do you honestly think that we should simply trust that once you have extracted these numbers, performed a Luhn algorithm to verify these as credit card numbers, you are not going to fraudulently use these credit card numbers!?
I have marked your posting as an attempt to hack an Oracle database for fraudulent use of credit card data. I hope that your OTN account is terminated soon and trust that your too much of a coding idiot to actually succeed in this endevour.

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