| China | A | | 1973 |
| Greece | A | | 1958 |
| Italy | A | Giuliano (INORC) | 1957 |
| Japan | A | | 1958 |
| Norway | A | | 1958 |
| Panama | A | | 1958 |
| Republic of Korea | A | | 1962 |
| Russian Federation | A | | 1958 |
| United Kingdom of Great Britain and Northern Ireland | A | | 1949 |
| United States of America | A | | 1950 |
| | | |
| Argentina | B | | 1953 |
| Bangladesh | B | | 1976 |
| Brazil | B | | 1963 |
| Canada | B | | 1948 |
| Germany | B | Juergen (PFB) | 1959 |
| France | B | | 1952 |
| India | B | | 1959 |
| Netherlands | B | | 1949 |
| Spain | B | | 1962 |
| Sweden | B | | 1959 |
| | | |
| Australia | C | | 1952 |
| Bahamas | C | | 1976 |
| Belgium | C | | 1951 |
| Chile | C | | 1972 |
| Cyprus | C | | 1973 |
| Denmark | C | | 1959 |
| Egypt | C | | 1958 |
| Indonesia | C | | 1961 |
| Jamaica | C | | 1976 |
| Kenya | C | | 1973 |
| Malaysia | C | | 1971 |
| Malta | C | | 1966 |
| Mexico | C | | 1954 |
| Nigeria | C | | 1962 |
| Philippines | C | | 1964 |
| Saudi Arabia | C | | 1969 |
| Singapore | C | | 1966 |
| South Africa | C | | 1995 |
| Thailand | C | | 1973 |
| Turkey | C | | 1958 |
| | | |
| Albania | | | 1993 |
| Algeria | | | 1963 |
| Angola | | | 1977 |
| Antigua and Barbuda | | | 1986 |
| Austria | | | 1975 |
| Azerbaijan | | | 1995 |
| Bahrain | | | 1976 |
| Barbados | | | 1970 |
| Belize | | | 1990 |
| Benin | | | 1980 |
| Bolivia (Plurinational State of) | | | 1987 |
| Bosnia and Herzegovina | | | 1993 |
| Brunei Darussalam | | | 1984 |
| Bulgaria | | | 1960 |
| Cambodia | | | 1961 |
| Cameroon | | | 1961 |
| Cape Verde | | | 1976 |
| Colombia | | | 1974 |
| Comoros | | | 2001 |
| Congo | | | 1975 |
| Cook Islands | | | 2008 |
| Costa Rica | | | 1981 |
| Côte d'Ivoire | | | 1960 |
| Croatia | | | 1992 |
| Cuba | | | 1966 |
| Czech Republic | | | 1993 |
| Democratic People's Republic of Korea | | | 1986 |
| Democratic Republic of the Congo* | | | 1973 |
| Djibouti | | | 1979 |
| Dominica | | | 1979 |
| Dominican Republic | | | 1953 |
| Ecuador | | | 1956 |
| El Salvador | | | 1981 |
| Equatorial Guinea | | | 1972 |
| Eritrea | | | 1993 |
| Estonia | | | 1992 |
| Ethiopia | | | 1975 |
| Fiji | | | 1983 |
| Finland | | | 1959 |
| Gabon | | | 1976 |
| Gambia | | | 1979 |
| Georgia | | | 1993 |
| Ghana | | | 1959 |
| Grenada | | | 1998 |
| Guatemala | | | 1983 |
| Guinea | | | 1975 |
| Guinea-Bissau | | | 1977 |
| Guyana | | | 1980 |
| Haiti | | | 1953 |
| Honduras | | | 1954 |
| Hungary | | | 1970 |
| Iceland | | | 1960 |
| Iran (Islamic Republic of) | | | 1958 |
| Iraq | | | 1973 |
| Ireland | | | 1951 |
| Israel | | | 1952 |
| Jordan | | | 1973 |
| Kazakhstan | | | 1994 |
| Kiribati | | | 2003 |
| Kuwait | | | 1960 |
| Latvia | | | 1993 |
| Lebanon | | | 1966 |
| Liberia | | | 1959 |
| Libyan Arab Jamahiriya | | | 1970 |
| Lithuania | | | 1995 |
| Luxembourg | | | 1991 |
| Madagascar | | | 1961 |
| Malawi | | | 1989 |
| Maldives | | | 1967 |
| Marshall Islands | | | 1998 |
| Mauritania | | | 1961 |
| Mauritius | | | 1978 |
| Monaco | | | 1989 |
| Mongolia | | | 1996 |
| Montenegro | | | 2006 |
| Morocco | | | 1962 |
| Mozambique | | | 1979 |
| Myanmar | | | 1951 |
| Namibia | | | 1994 |
| Nepal | | | 1979 |
| New Zealand | | | 1960 |
| Nicaragua | | | 1982 |
| Oman | | | 1974 |
| Pakistan | | | 1958 |
| Papua New Guinea | | | 1976 |
| Paraguay | | | 1993 |
| Peru | | | 1968 |
| Poland | | | 1960 |
| Portugal | | | 1976 |
| Qatar | | | 1977 |
| Republic of Moldova | | | 2001 |
| Romania | | | 1965 |
| Saint Kitts and Nevis | | | 2001 |
| Saint Lucia | | | 1980 |
| Saint Vincent and the Grenadines | | | 1981 |
| Samoa | | | 1996 |
| San Marino | | | 2002 |
| Sao Tome and Principe | | | 1990 |
| Senegal | | | 1960 |
| Serbia | | | 2000 |
| Seychelles | | | 1978 |
| Sierra Leone | | | 1973 |
| Slovakia | | | 1993 |
| Slovenia | | | 1993 |
| Solomon Islands | | | 1988 |
| Somalia | | | 1978 |
| Sri Lanka | | | 1972 |
| Sudan | | | 1974 |
| Suriname | | | 1976 |
| Switzerland | | | 1955 |
| Syrian Arab Republic | | | 1963 |
| The former Yugoslav Republic of Macedonia | | | 1993 |
| Timor-Leste | | | 2005 |
| Togo | | | 1983 |
| Tonga | | | 2000 |
| Trinidad and Tobago | | | 1965 |
| Tunisia | | | 1963 |
| Turkmenistan | | | 1993 |
| Tuvalu | | | 2004 |
| Uganda | | | 2009 |
| Ukraine | | | 1994 |
| United Arab Emirates | | | 1980 |
| United Republic of Tanzania | | | 1974 |
| Uruguay | | | 1968 |
| Vanuatu | | | 1986 |
| Venezuela (Bolivarian Republic of) | | | 1975 |
| Viet Nam | | | 1984 |
| Yemen | | | 1979 |
| Zimbabwe | | | 2005 |
| Associate Members: | | |
|
|---|
| Hong Kong, China | | | 1967 |
| Macao, China | | | 1990 |
| The Faroe Islands, Denmark | | | 2002 |
| 169 | | | | |