UK NINO Validator
Online UK National Insurance Number (NINO) validator. Verify DWP constraints.
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How does NINO validation work?
Validation checks if the NINO has exactly 9 characters (two prefix letters, six central digits, and a final suffix A, B, C, or D).
The validator checks strict DWP constraints: first letter cannot be D, F, I, Q, U, V, or O; second letter cannot be D, F, I, Q, U, V, or O; and specific geographic/test prefixes (like BG, GB, NK, ZZ) are marked as invalid.