Tools/SIT X-Ray/U.K. National Insurance Number (NINO)

U.K. National Insurance Number (NINO)

live testingcurated2 patternsproximity 300recommended confidence 75 (medium)

Two prefix letters, six digits, and a suffix letter A-D, with spaces optional. Invalid prefix letters and disallowed combinations (BG, GB, NK, KN, TN, NT, ZZ) are rejected.

The MEDIUM confidence pattern needs no keywords at all: any validly formatted NINO matches at 75 on its own. The keyword list only lifts it to 85. If your DLP rule triggers at medium confidence, every NINO-shaped string in every document is in scope.

The patterns, as the engine reads them

confidence 85 (high)

Primary: Func_uk_nino: Two prefix letters (D, F, I, Q, U, V never used; O not allowed second; BG, GB, NK, KN, TN, NT, ZZ rejected), six digits, suffix A-D. Spaces optional.
Required: Keyword_uk_nino: 19 keywords (word match), e.g. "national insurance number", "national insurance contributions", "protection act"

confidence 75 (medium)

Primary: Func_uk_nino: Two prefix letters (D, F, I, Q, U, V never used; O not allowed second; BG, GB, NK, KN, TN, NT, ZZ rejected), six digits, suffix A-D. Spaces optional.
Evidence: none required. The primary element alone decides the match.

Test your text against this SIT Open in Builder Microsoft Learn definition

Related SITs

Others in the U.K. group.

U.K. Driver's License Number U.K. Electoral Roll Number U.K. National Health Service Number U.K. Physical Addresses U.K. Unique Taxpayer Reference Number

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Catalogue data reflects Microsoft's built-in SITs, which are the same in every tenant. This is a faithful simulation, not the live service, so confirm with the portal's SIT test before acting on a result.