Free Tool
SSN Format Validator
Instantly verify whether a Social Security Number follows valid IRS formatting rules. This tool checks structure, area/group/serial ranges, and known invalid numbers.
0/9 digitsType or paste with or without dashes
What we check
- Exactly 9 digits (dashes are optional)
- Area number (first 3 digits): 001–899, excluding 666
- Group number (middle 2 digits): 01–99
- Serial number (last 4 digits): 0001–9999
- Known invalid/sample SSNs (e.g., 078-05-1120)
- Area numbers 900–999 flagged as ITIN/Adoption reserved
Privacy note: Validation happens entirely in your browser. No SSN data is sent to any server, stored, or logged. Refreshing the page clears everything.
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