The islands of Curaçao and Sint Maarten become autonomous countries of the Kingdom of the Netherlands, with the following two-letter and three-letter country codes issued under the ISO standard ISO 3166-1:

   – Sint Maarten (Dutch part)    SX    SXM

   – Curaçao    CW    CUW

The islands of Bonaire, Saint Eustatius and Sababecome Dutch municipalities which are assigned the following ISO 3166-1 code:

   – Bonaire, Saint Eustatius and Saba    BQ    BES

The codes for the Netherlands Antilles are deleted from ISO 3166-1 and transitionally reserved for a period of 50 years:

   – Netherlands Antilles     AN    ANT

ISO 3166 country codes are widely used as abbreviations to identify countries in contexts such as postal addresses, Internet domain names and computerized financial transactions.They have largely replaced some 70 different systems of country codes developed over time by individual countries, and public and private sector organizations, with an accompanying potential for confusion.

The ISO codes are assigned under transparent procedures by the ISO 3166 Maintenance Agency which makes them available free of charge. ISO assigns the codes, but does not determine whether a territory is a country. The usual practice is to assign codes only to countries recorded as such by the United Nations in either the Terminology Bulletin Country Names or in the Country and Region Codes for Statistical Use. maintained by the United Nations Statistics Division.

The two-letter codes are the most commonly used, while the three-letter codes are for special uses where a closer identification of the code with the full name of the country concerned is required. They are used notably in machine-readable passports meeting the requirements of the International Civil Aviation Organization.