United States
What is a Social Security Number (SSN)?
A Social Security Number is a nine-digit identifier issued by the US Social Security Administration. It is used in tax reporting and benefit records and is highly sensitive personal data; a number's shape alone cannot prove identity or validity.
Common format
AAA-GG-SSSS (9 digits)
A format description is not a real-world validation result.
Key facts
- โModern assignment is randomized; the old geographic interpretation should not be used for new validation.
- โNo valid SSN starts with 000, uses 00 in the middle group, or 0000 in the final group.
- โThe first three digits cannot be 666 or fall in 900โ999.
- โNever log, expose, or use a generated value in real identity, tax, credit, employment, or benefit workflows.
Testing and privacy boundary
FakeAddrGen only creates formatted fictional fixtures. Never submit output to government, tax, identity, credit, employment, benefit, or financial systems, and never copy real identifiers into screenshots, logs, tickets, or staging databases. Use institution-approved sandboxes for official integrations.