A Developer's Guide to the SSN Validator

The SSN Validator is a tool designed for developers and testers to check the format of a U.S. Social Security Number (SSN) and verify it against a list of known invalid patterns.

Disclaimer: This tool is for development and testing purposes only. Do not use real Social Security Numbers. All validation is performed locally in your browser and is not sent over the network. This tool does not and cannot verify if an SSN belongs to a real person.

Features

• Format Validation: Checks if the input is a 9-digit number, accepting formats with or without hyphens.
• Invalid Pattern Detection: The tool checks the SSN against rules published by the Social Security Administration (SSA), such as:
  • The area number (first three digits) cannot be 000, 666, or in the 900-999 range.
  • The group number (middle two digits) cannot be 00.
  • The serial number (last four digits) cannot be 0000.
• State of Issuance (Pre-2011): For SSNs that follow the pre-2011 assignment pattern, the tool can identify the state or territory where the number was likely issued based on the area number. It also notes that this system is no longer in use.

How to Use

1. Enter an SSN: Type or paste a test SSN into the input field.
2. Click Validate: Press the "Validate" button.
3. Review the Result:
   • An alert will inform you if the SSN is Valid or Invalid based on the known rules.
   • If the number is valid and matches a pre-2011 pattern, a card will appear showing the likely state of issuance.