Mastercard Credit Cards — Commonwealth Bank Of Australia - IIN 555005

Credit card numbers that start with the Issuer Identification Number (IIN) 555005 are Mastercard credit cards issued by Commonwealth Bank Of Australia in Australia. Commonwealth Bank Of Australia issues cards under a total of seven IIN numbers including this one, so some card numbers issued by Commonwealth Bank Of Australia may start with IIN numbers from one of these other ranges. You can view a list of all seven of Commonwealth Bank Of Australia's IIN numbers here. For more information, call Commonwealth Bank Of Australia at 131576.

Commonwealth Bank Of Australia

5550 05XX XXXX XXXX

5550 Valid Thru 08/2025

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Card Scheme	Mastercard
Bank Name	Commonwealth Bank Of Australia
Card Type	CREDIT
IIN	555005
Card Number	5550 05XX XXXX XXXX
Bank Phone	131576
Bank Country	Australia

Anatomy of a Commonwealth Bank Of Australia 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 555005 indicates that this card was issued by Commonwealth Bank Of Australia in Australia.

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.