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ICAO VMC Minima
Federal Aviation Administration
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Most countries are member of the International Civil Aviation Organization (ICAO) and as such have signed the "Chicago Convention 1944" (111 pages, 2 Mb). Aviation rules and regulations in member countries are based on the recommendations made by the ICAO.
ICAO Annex 11: Air Traffic Services, Chapter 2, Section 2.6 describes the classifications of airspaces classes A - G and the services the pilot may expect from air traffic control. The table below shows this in a more comprehensible form.
All currently known ICAO Airspace classes A - G are listed in the table below:
Based on: ICAO Annex 11: Air Traffic Services, Chapter 2, Section 2.6 and Appendix 4. Read the full details in the original Annex 11 here.
Remember that each country can and does apply changes to the standard ICAO airspace classification, so be sure to read the most current relevant AIP.