Japan
What is a Japan My Number?
Japan's Individual Number, commonly called My Number, is a 12-digit number used in social security, taxation, and disaster-response administration. It is sensitive personal information and should not be copied into general-purpose test fixtures or sent to production verification services.
Common format
12 digits
A format description is not a real-world validation result.
Key facts
- โThe individual number contains 12 digits and includes a check-digit rule.
- โA visually correct 12-digit string is not evidence of assignment or identity.
- โAccess, collection, storage, and sharing are subject to strict purpose and security controls.
- โUse isolated synthetic fixtures for UI masks; use authorized test environments for official integrations.
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.