Postal codes in Brunei are known as postcodes (Malay: poskod) and they are alphanumeric, consisting of two letters followed by four digits. Postcodes in Brunei are issued by the Postal Services Department, a government department under the Ministry of Communications.
A Bruneian postcode has six characters, consisting of two uppercase letters and immediately followed by four digits. Examples of postcodes are "BB3713" which represents the postcode area Kampong Anggerek Desa; "KB4533" which represents Kampong Panaga; and "BA2110" which represents Jabatan Hal Ehwal Masjid or the Department of Mosque Affairs.
The components of a postcode comprises four types of codes representing districts, subdistricts, villages and post offices.
The first letter denotes the district code, which corresponds to the districts (Malay: daerah) of Brunei.
The second letter denotes the subdistrict code, corresponding directly to the subdistricts (Malay: mukim) of Brunei, the country's second-level administrative divisions.
The first two digits after the two letters represent the village code. Usually, it corresponds directly to the villages (Malay: kampung), the country's third- and lowest-level administrative divisions. However, a few villages may have more than one postcode areas. Some postcode areas may also represent defunct villages or villages which have been subsumed under other nearby villages.
The last two digits represent the post office code, which generally correspond to the post office of, or nearest to, the area or subdistrict. A few may also correspond to the function of the place, and this exclusively refers to government ministries or departments. They have postcodes with the last digit "0" (such as from the above example "BA2110", which represents the Department of Mosque Affairs, a government department under the Ministry of Religious Affairs).