Dear Department for work and pensions
I understand that the National Insurance Number (NINO) is in the
format "AA NN NN NN A", where A represents a letter and N a number
Could you please provide the following information under the
Freedom of Information Act:
1. A list of the two-letter combinations ever used as the first two
characters of NINOs so far issued to people in the UK.
2. A list of the two-letter combinations ever used as the first two
characters of NINOs used for administrative or other special
reasons (e.g. "TN", "MW", "PP").
3. A list of the two-letter combinations scheduled to be used as
the first two characters of future NINOs for people in the UK.
4. A list of the two-letter combinations scheduled to be used as
the first two characters of future NINOs for administrative or
other special reasons.
5. A list of letters ever used as the final (9th) character of
6. The reasons why "GB", "BG", "NK", "KN", "NT", and "ZZ" cannot be
used as the first two characters of a NINO.
7. The reasons why "F", "M", and "P" were used as the final (9th)
character of NINOs.
Could you also answer the following questions:
1. Is it true that the numbers (the 3rd–8th characters) of NINOs
are allocated consecutively from "000000" to "999999"? (And if not,
how are they allocated? And from what starting number does the
allocation begin? And at which number does it end?)
2. Do any of the characters of NINOs act as a "check digit" by
which the validity of the NINO can be verified (using the otherz
constituent characters of the NINO)?
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Dear John Compton,
I am writing in response to your request for information, received 2nd
DWP Central FoI Team
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