How does the Discover Card number start?

American Express cards – Begin with a 3, followed by a 4 or a 7 has 15 digits.

Discover cards – Begin with a 6 and have 16 digits.

Diners Club and Carte Blanche cards – Begin with a 3, followed by a 0, 6, or 8 and have 14 digits.

What Digits does Discover card start with?
There are Diners Club cards that begin with 5 and have 16 digits. These are a joint venture between Diners Club and MasterCard, and should be processed like a MasterCard. Discover: ^6(?:011. 5[0-9]{2})[0-9]{12}$ Discover card numbers begin with 6011 or 65.

Where is my Discover card account number?
Steps

Find the number located on the front of your card. Your credit card number should be either printed or embossed in raised numbers across the front of your card.
Skip past the first 6 numbers on your card.
Exclude the last number on your card.
Write down the remaining numbers to find your account number.

What numbers do American Express cards start with?
All American Express card account numbers are embossed and begin with “37” or “34”. This rule applies to all AmEx cards. By comparison, Visa card numbers begin with “4,” MasterCard’s start with “5” and Discover’s — with “6”.

What number do credit cards start with?
If you see a credit card number that starts with a 4 and contains 19 digits, you can assume it’s a Visa. Mastercard and Discover account numbers contain 16 digits. American Express contains 15 digits, and Diner’s Club and Carte Blanche contain 14 digits.

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