A NINO is made up of 2 letters, 6 numbers and a final letter, which is always A, B, C, or D.

It looks something like this:

QQ 12 34 56 A

This is an example only and should not be used as an actual number.

The Prefix

Currently a prefix is chosen and then used until all the possible numbers have been allocated. Then another prefix is used, but not necessarily the next one alphabetically.

All prefixes are valid except:

The characters D, F, I, Q, U, and V are not used as either the first or second letter of a NINO prefix.

The letter O is not used as the second letter of a prefix.

Prefixes BG, GB, KN, NK, NT, TN and ZZ are not to be used

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