What A Credit Card's First Digit Means
You can tell a lot about a person by looking at their shoes, and likewise, by looking at their credit card's first digit. This represents the Major Industry Identifier, which is to say, the type of institution that issued the card. Here's the breakdown.
1,2: Airlines
3: Travel/Entertainment
4,5: Banking/Financial
6: Merchandising/Financial
7: Petroleum
8: Telecommunications
0,9: Other
