Mastercard BIN list Mastercard Debit Cards — Dfcu Financial - IIN 551215

Debit card numbers that start with the Issuer Identification Number (IIN) 551215 are Mastercard debit cards issued by Dfcu Financial in United States. Dfcu Financial issues cards under a total of two IIN numbers including this one, so some card numbers issued by Dfcu Financial may start with IIN numbers from one of these other ranges. You can view a list of all two of Dfcu Financial's IIN numbers here. For more information, call Dfcu Financial at (888) 918-7880.

Dfcu Financial
credit card chip
5512 Valid Thru 08/2024
John Q. Cardholder
Card Scheme Mastercard
Bank Name Dfcu Financial
Card Type DEBIT
IIN 551215
Card Number 5512 15XX XXXX XXXX
Bank Phone (888) 918-7880
Bank Country United States

Anatomy of a Dfcu Financial Mastercard 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 5 indicates that this is a Mastercard 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 551215 indicates that this card was issued by Dfcu Financial in United States.

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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