used to more efficiently sort and route mail within the Australian postal system.

Postcodes in New Zealand consist of four digits, the first two of which specify the area, the third the type of delivery (street, PO Box, Private Bag, or Rural delivery), and the last the specific lobby, RD (rural delivery) number, or suburb.

Postal codes in Brunei Darussalam are known as postcodes, and they are alphanumeric; consisting of two letters followed by four digits.