If there are more than a million such cards, it is certain that two of them share the same last four digits.
It is still possible (but unlikely) that your last four digits are unique.
Assuming the numbers are unique, there are 106−1 other numbers that would match yours in the last four digits.
Are the last 4 digits of a credit card unique?
How unique are the last 4 digits of a credit card? In our application we use the card type and last 4 digits provided by a merchant terminal as a unique identifier for customers. For example VISA-1234 .
Can someone use the last four digits of my credit card?
If you are talking about a debit or credit card or even a gift card, that is not a problem. It is for security reasons. You need the WHOLE number and, if online or on the phone, the CVV on the back of the card (which means you have to have it in hand). Having the last 4 digits is meaningless.
What are the last 4 digits of a credit card called?
On Visa, MasterCard, and Discover cards, the code is a three-digit code on the back of your card. The preceding four digits (“3456” in the image above) are the last four digits of your card number. On American Express cards, the security code is a four-digit code on the front of the card.
What can be done with last four digits of SSN?
The more your number is out there, the greater the risk of identity theft. Guard the Final Four. Although most widely used and shared, the last four digits are in fact the most important to protect. These are truly random and unique; the first five numbers represent when and where your Social Security card was issued.