UK National Insurance Number Generator & Validator

Generate Valid NINOs Instantly & Verify Existing Numbers

About UK National Insurance Numbers

A National Insurance Number (NINO) is your unique identifier for the UK tax and social security system. Our tool helps you validate existing NINOs or generate test numbers.

NINO Format:

  • Two prefix letters
  • Six digits
  • One suffix letter
  • Example: BN 10 29 66 C

Note: Certain prefixes (ZZ, NT, TN, KN, BG, NK, GB) and letters (D, F, I, Q, U, V as first letters, O as second letter) are not used in valid NINOs.


Understanding UK National Insurance Numbers

The National Insurance number (NINO) is a crucial identifier in the United Kingdom's social security and tax systems. It serves as your personal account number for:

  • Social security administration
  • Tax payments and records
  • Employment documentation
  • Government benefits

Every UK citizen and eligible worker needs a NINO for employment and benefits purposes. This unique identifier helps track your contributions and ensures proper administration of your benefits.