Amex BIN list Amex Credit Cards — Saison Card - IIN 377783

Credit card numbers that start with the Issuer Identification Number (IIN) 377783 are Amex credit cards issued by Saison Card in Japan. Note that this is the only IIN range issued by Saison Card, so all cards issued by this provider will be of the format 3777 83XX XXXX XXXX.

Saison Card
credit card chip
3777 Valid Thru 08/2025
John Q. Cardholder
Card Scheme Amex
Bank Name Saison Card
Card Type CREDIT
IIN 377783
Card Number 3777 83XX XXXX XXXX
Bank Country Japan

Anatomy of a Saison Card Amex Credit Card Number

While credit card number may seem like a random string of digits, they actually contain a large amount of valuable data about the card that can be used for validation and verification purposes.

Digit 1 — The MII

The first digit of the card is known as the MII digit, and indicates the credit card's scheme. In this case, the MII of 3 indicates that this is a Amex card.

Digits 1-6 — The IIN / BIN

The first six digits of the card number, inclusive of the MII, are called the IIN (Issuer Identification Number) or BIN (Bank Identification Number). This sequence uniquely identifies the bank that issued the card. In this case, the IIN of 377783 indicates that this card was issued by Saison Card in Japan.

Digits 7-15 — The Account Number

Digits 7-15 of the credit card number contain the Primary Account Number, or PAN, issued by the bank to uniquely identify the account holder. These 8 digits are the most important part of the credit card number.

Digit 16 — The Check Digit

The last digit of the card number (the 16th digit in most cases) is the check digit, which is calculated by applying a mathematical formula called the Luhn algorithm to the preceding portions of the account number. While not actually part of the account number itself, the check digit is essential to allow easy validation of card numbers and detection of typos, missed digits, etc.

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