SSN Validator

Validate US Social Security Number (SSN) format. Check if a 9-digit number follows SSN rules and patterns.

⚠️ SECURITY WARNING

NEVER enter your real Social Security Number on any website unless absolutely necessary. This validator is for educational purposes and format checking only. All validation happens in your browser—we do not store or transmit any data. However, SSNs are highly sensitive and should be protected.

Enter Social Security Number

SSN (9 digits)

Format: XXX-XX-XXXX (dashes are automatically added)

For Testing Only

DO NOT use real SSNs. The SSA provides test numbers for software development:

• Test Range: 987-65-4320 to 987-65-4329
• These are designated for testing purposes only
• Never valid for actual identification

SSN Format Rules

Social Security Numbers are 9-digit numbers issued by the US Social Security Administration. They follow specific format rules to prevent duplication and identify invalid numbers.

Structure (XXX-XX-XXXX):

Area Number (XXX): First 3 digits - geographic or randomized (after 2011)
Group Number (XX): Middle 2 digits - used for administrative purposes
Serial Number (XXXX): Last 4 digits - unique identifier

Invalid SSN Patterns:

✗ Area number 000, 666, or 900-999
✗ Group number 00
✗ Serial number 0000
✗ All same digits (e.g., 111-11-1111)
✗ Known advertisement numbers (e.g., 078-05-1120)

FAQ

Does this verify if an SSN is actually issued?

No. This validator only checks if the format follows SSN rules. It does NOT verify if an SSN is registered, active, or belongs to a specific person. Only the Social Security Administration can confirm that.

Is it safe to use this validator?

All validation happens in your browser locally—nothing is sent to servers. However, we strongly recommend NEVER entering real SSNs online unless on official government or verified employer portals with HTTPS encryption.

When would I need to validate an SSN format?

SSN format validation is used in HR systems, payroll software, tax preparation applications, and identity verification systems to catch data entry errors before submission. Always use test numbers during software development.