OCA Zone 1 (West Asia)
Bahrain
Iran
Iraq
Jordan
Kuwait
Lebanon
Oman
Palestine
Qatar
Saudi Arabia
Syria
United Arab Emirates
Yemen
OCA Zone 2 (Central Asia)
Afghanistan
Kazakhstan
Kyrgyzstan
Tajikistan
Turkmenistan
Uzbekistan
OCA Zone 3 (South Asia)
Bangladesh
Bhutan
India
Maldives
Nepal
Pakistan
Sri Lanka
OCA Zone 4 (East Asia)
China
Hong Kong
Macau
Japan
North Korea
South Korea
Chinese Taipei
Mongolia
OCA Zone 5 (Southeast Asia)
Brunei
Cambodia
Indonesia
Laos
Malaysia
Myanmar
Philippines
Singapore
Thailand
Timor-Leste
Vietnam