Police National Computer Id (PNC Id)
1 November 2021
To identify a particular person by the number allocated by police when creating a record on the PNC.
A single value made of 2 digit year part and a fixed 7 digit serial part, i.e. YYNNNNNNN, (leading zeroes used to expand serial part to 7 digits) is put through the Modulus 23 algorithm. The derived value is divided by 23 and the modulus (remainder) is converted to a character i.e. 1 is A, 2 is B, 3 is C, …..to 0 is Z (ignoring I, O and S).
(Note: Display format is YY/NNNNNNND i.e. the century and leading zeroes of the serial number part are suppressed.)