Are these real National Insurance numbers?

No. They are randomly generated to match the format only and should never be used for real individuals.

Do the outputs pass HMRC validation?

They follow the published format rules, but there is no authoritative lookup in the browser.

Why do some prefixes never appear?

Certain letter combinations are reserved or invalid in the UK system, so the generator skips them.

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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

CY 77 45 65 B
YS 48 18 79 B
BA 85 01 28 A
LN 26 68 66 C
GH 05 87 13 B

How to use this tool

Choose how many UK NINOs you need and generate a fresh batch.
Copy a number (without spaces) into forms or test datasets.
Regenerate to create new prefixes and suffix letters for edge cases.

Where this helps

Populate onboarding flows that require a National Insurance number field.
Seed QA databases with realistic UK identity samples.
Test masking and redaction rules without touching real user data.

Format rules included

Prefix letters omit D, F, I, Q, U, V, and O for real-world formatting.
Restricted prefix combinations like GB and TN are excluded.
Suffix letters are limited to A-D per UK NINO standards.

FAQ

Are these real National Insurance numbers?: No. They are randomly generated to match the format only and should never be used for real individuals.
Do the outputs pass HMRC validation?: They follow the published format rules, but there is no authoritative lookup in the browser.
Why do some prefixes never appear?: Certain letter combinations are reserved or invalid in the UK system, so the generator skips them.