US SSN Format Validator
Syntax only. Never claims an SSN is assigned or real.
Format AAA-GG-SSSS (area, group, serial). Dashes added automatically.
Area (AAA)
Group (GG)
Serial (SSSS)
Strong disclaimer
Syntax only — not verification. Passing this check does not mean the SSN is assigned, valid, or belongs to anyone. SSA does not publish a public checksum for SSNs.
No generator. This tool does not create or suggest SSNs.
Privacy: All checks run in your browser; nothing is transmitted or stored.
Never enter real SSNs on untrusted sites. Protect SSNs like financial credentials.
Rejected ranges (published SSA rules)
- Area 000, 666, or 900–999
- Group 00
- Serial 0000
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