Invalid social security numbers (SSNs) can indicate possible fraud. They're often easy to detect, and closer investigation can significantly reduce damages to your business. This is especially true when SSN validation is performed at initial point of contact or account inception.

QCS offers a simple, cost-effective tool for detecting invalid SSNs. Our database includes a list of numbers, their assignment status, the place of issuance, and the time periods when they were issued.

Fewer than half of all possible SSNs have ever been assigned. Even fewer were assigned after a given date.

If someone gives 1976 as his year of birth, then his SSN must have been assigned in 1976 or later. Our database shows the valid possibilities are less than a fifth of all possible 9-digit numbers. Thus, it detects the vast majority of random attempts to invent SSNs by people claiming to be this age.

Users of our database have included insurers, insurance crime investigators, and a class action settlement trust. We make monthly updates to these data in an ASCII text file.

If we may be of service to you, please to send us an email. We do not disseminate this product to the general public, so please be prepared to establish your organization's bona fides.

(See our related pages on Simulation Studies of Social Security Number Validation as well as data quality control issues in the Social Security Administration's Death Master File).