which numbers do amex card start with
Start with the first digit. It, and in some cases the second digit, identifies the card network that will carry the transaction. All MasterCards start with a â5,â for example. Visa cards start with a â4.â Discover cards get a â6.â. American Express cards start with â34â or â37,â while the number â7â is reserved for gasoline cards issued by petroleum companies such as Exxon and Mobil.