The United Nations geoscheme for Oceania is an internal tool created and used by the UN's Statistics Division (UNSD) for the specific purpose of UN statistics.
[1] Oceania UN geoscheme subregions of Oceania The following is an alphabetical list of subregions as defined by the UNSD geoscheme.
[1] The United Nations geoscheme subdivides the region into Australia and New Zealand, Melanesia, Micronesia, and Polynesia.
The UNSD notes that "the assignment of countries or areas to specific groupings is for statistical convenience and does not imply any assumption regarding political or other affiliation of countries or territories".
[1] The number between parentheses is the UN M49 code (009 for the whole of Oceania).