first numbers identifying card issuer:
| Issuer | Identifier | Card Number 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 |
| first digit | Issuer Category |
| 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 |
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