 These special post codes are not listed in the public phonebook, though there is a book which contains them and can be bought at an Austrian post office.Postal codes in Belgium

Postal codes in Belgium are numeric and consist of 4 numbers.The first digit indicates the province (except for the 3xxx numbers that are shared by the eastern part of Flemish Brabant and Limburg, the 6xxx that are shared between the Hainaut and Luxembourg province, and the 1xxx that are shared by the Brussels Capital Region, the western part of Flemish Brabant and Walloon Brabant).