Description: ISO 3166-2:BN is the entry for Brunei in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization , which defines codes for the names of the principal subdivisions of all countries coded in ISO 3166-1. Currently for Brunei, ISO 3166-2 codes are defined for 4 districts. Each code consists of two parts, separated by a hyphen. The first part is BN, the ISO 3166-1 alpha-2 code of Brunei. The second part is two letters.