The country code 599 was assigned to the Netherlands Antilles (dissolved in 2010),[1] and is in use by Curaçao and the Caribbean Netherlands (Bonaire, Sint Eustatius and Saba).
[2] Aruba and Sint Maarten, also former parts of the Netherlands Antilles, discontinued using the code in 1986 and 2011 respectively.
On 2 October 2009, the North American Numbering Plan Administration (NANPA) announced that it had approved the request of Sint Maarten's government to join the NANP and had assigned the territory area code 721.
Effective 30 September 2011, Sint Maarten's country code changed to the NANP standard of 1.
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