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Yes, it's common practice to ask for 6 + 4 on a 16-25 digit card number. You're not being asked for the entire number, just 2 parts of it to ensure you are the right account holder. Yes, it's common practice to ask for 6 + 4 on a 16-25 digit card number.

The Bank Identification Number (BIN), also known as the Issuer Identification Number, is the first 4?8-digit sequence at the beginning of the card number. As you can see in the table above, the BIN contains the industry identifier and indicates the financial institution that issued the card.

The first four digits are part of the BIN or IIN, a six-digit number that identifies the card issuer. These numbers contain valuable information about a credit card. The first digit of a credit card specifies the card's payment network and industry.

Visa card numbers start with a 4. American Express numbers start with a 3.

Visa cards begin with a 4 and have 13 or 16 digits. Mastercard cards begin with a 5 and has 16 digits. 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.

Entering Your Credit Card Information Find your credit card's account number, security code, and expiration date. Find the Payment Account box on the Payment Information page. Type your credit card number in the Card Number field. Type your card's security code in the Security Code box if you have one.

The parts of the number are as follows: a six or eight-digit Issuer Identification Number (IIN), the first digit of which is the major industry identifier (MII) a variable length (up to 12 digits) individual account identifier. a single check digit calculated using the Luhn algorithm.