Code Value Notes
Alpha-2 TO Alpha-2 code from ISO 3166-1
Alpha-3 TON Alpha-3 code from ISO 3166-1
Numeric 776 Numeric code from ISO 3166-1
ITU TON Codes assigned by the International Telecommunications Union
FIPS TN Codes from the U.S. standard FIPS PUB 10-4
IOC TGA Codes assigned by the International Olympics Committee
FIFA TGA Codes assigned by the Fédération Internationale de Football Association
DS   Distinguishing signs of vehicles in international traffic
WMO TO Country abbreviations used in weather reports from the World Meteorological Organization
GAUL 245 Global Administrative Unit Layers from the Food and Agriculture Organization
MARC to MAchine-Readable Cataloging codes from the Library of Congress
DIAL 676 Country code from ITU-T recommendation E.164 (international dialing code)
TLD .to Country code Top Level Domain