what numbers form credit card number?

Answer 1

The first digit of your credit card number is the Major Industry Identifier (MII), which represents the category of entity which issued your credit card. Different MII digits represent the following issuer categories:
0 ISO/TC 68 and other industry assignments
1 Airlines
2 Airlines and other industry assignments
3 Travel and entertainment
4 Banking and financial
5 Banking and financial
6 Merchandizing and banking
7 Petroleum
8 Telecommunications and other industry assignments
9 National assignment


The first 6 digits of your credit card number (including the initial MII digit) form the issuer identifier. This means that the total number of possible issuers is a million (10 raised to the sixth power, or 1,000,000).

Some of the better known issuer identifiers are listed in the following table:

Issuer Identifier CN Length
Diner's Club/Carte Blanche 300xxx-305xxx,
36xxxx, 38xxxx 14
American Express 34xxxx, 37xxxx 15
VISA 4xxxxx 13, 16
MasterCard 51xxxx-55xxxx 16
Discover 6011xx 16

Digits 7 to (n - 1) of your credit card number are your individual account identifier. The maximum length of a credit card number is 19 digits. Since the initial 6 digits of a credit card number are the issuer identifier, and the final digit is the check digit, this means that the maximum length of the account number field is 19 - 7, or 12 digits. Each issuer therefore has a trillion (10 raised to the 12th power, or 1,000,000,000,000) possible account numbers.

The final digit of your credit card number is a check digit, akin to a checksum. The algorithm used to arrive at the proper check digit is called the Luhn algorithm, after IBM scientist Hans Peter Luhn (1896-1964), who was awarded US Patent 2950048 ("Computer for Verifying Numbers") for the technique in 1960. For details about Luhn's life, see

Biography on the American Society for Information Science and Technology's Web site, at http://www.asis.org/Features/Pioneers/luhn.htm.
Notes compiled by Susan K. Soy on "H.P. Luhn and Automatic Indexing" at http://www.gslis.utexas.edu/~ssoy/organizing/l391d2c.htm

Answer 2

Numbers from our base-10 numbering system form the numbers for our credit cards. Thank goodness. We'd have the dickens of a time telling a vender over the phone our credit card number in the base-2 numbering system.

Answer 3

The numbers 0 through 9.

There's not much special about them except the first few indicate the bank that issued the card and the type of card.

Answer 4

Hmm, and why would you be asking this? If you weren't trying to do something else besides actually wanting to know, you would've asked that question to the phone number on the card, not on here...

Answer 5

Wow psychpathz....if I've ever seen anything that qualifies as a "Best Answer" yours it it....

Who could ask for a more complete response!

Answer 6

Jsut look at your credit card and count it.

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