SSN Validator (US)

Validate the format of a US Social Security Number. This tool checks structure and known SSA rules.

Social Security Number: Enter with or without dashes

Try examples:

valid format common test invalid area invalid 666 invalid 9xx invalid group invalid serial

How It Works

SSN Structure

A US Social Security Number is a 9-digit number in the format AAA-GG-SSSS, consisting of three parts:

Area Number

XXX

First 3 digits

Group Number

XX

Middle 2 digits

Serial Number

XXXX

Last 4 digits

Validation Rules

Must be exactly 9 digits
Area number (first 3 digits) cannot be 000, 666, or 900-999
Group number (middle 2 digits) cannot be 00
Serial number (last 4 digits) cannot be 0000

Known Invalid SSNs

The SSA has explicitly flagged certain numbers as invalid:

078-05-1120 — Used in a 1938 wallet advertisement
219-09-9999 — Used in a 1962 advertisement
Any SSN used in official documentation as examples

Limitations

This validator checks format and structure only. It does NOT verify:

Whether the SSN has been issued to a person
Whether the SSN is currently active
The identity of the holder

Important: This tool is for educational and format-checking purposes only. Never enter a real Social Security Number on any website.

Embed This Util

You can embed this util on your own site as a widget. Adding ?embed=1 to the URL loads a compact version with just the tool itself; no header, menu, or documentation. Paste this snippet into your HTML:

Copy snippet Adjust the height to taste.

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