Are generated NINOs valid for real individuals?

No. They match format rules only and are not linked to any person.

Does this verify against HMRC records?

No. The tool generates syntactically valid test values and does not query government systems.

Why don’t some prefixes appear?

Reserved and invalid prefix combinations are intentionally filtered out.

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UK NINO Generator

Generate UK National Insurance numbers (NINOs) that follow the official format, exclude restricted prefixes, and use A-D suffix letters for safe testing.

Generated NINOs

Copy without spaces

BJ 71 36 08 B
XT 23 60 40 B
NY 44 18 38 B
XS 55 73 16 B
BP 59 37 84 D

How to use this tool

Set batch size and optional seed for deterministic output.
Generate and copy individual or full NINO batches.
Export TXT, CSV, or JSON for QA and audit workflows.

Built-in format controls

Prefix letters use HMRC-compatible allowed character sets.
Disallowed prefix pairs such as GB, TN, and ZZ are excluded.
Suffix letters are limited to A, B, C, or D.

Usage patterns

Seed onboarding and KYC form tests with realistic UK identity placeholders.
Use deterministic mode to reproduce bug reports and snapshot tests.
Share exported batches with QA without exposing live personal data.

FAQ

Are generated NINOs valid for real individuals?: No. They match format rules only and are not linked to any person.
Does this verify against HMRC records?: No. The tool generates syntactically valid test values and does not query government systems.
Why don’t some prefixes appear?: Reserved and invalid prefix combinations are intentionally filtered out.

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