| Contracting Party | Signature | Instrument | In Force | Details |
|---|
| Albania | | Accession: December 2, 1993 | March 6, 1994 | Details |
| Algeria | | Accession: January 19, 1998 | April 19, 1998 | Details |
| Andorra | | Accession: March 2, 2004 | June 2, 2004 | Details |
| Antigua and Barbuda | | Accession: December 17, 1999 | March 17, 2000 | Details |
| Argentina | | Accession: May 5, 1967 | June 10, 1967 | Details |
| Armenia | | Accession: July 19, 2000 | October 19, 2000 | Details |
| Australia | | Declaration of Continued Application: April 14, 1928 | April 14, 1928 | Details |
| Austria | | Accession: September 11, 1920 | October 1, 1920 | Details |
| Azerbaijan | | Accession: March 4, 1999 | June 4, 1999 | Details |
| Bahamas | | Declaration of Continued Application: July 5, 1976 | July 10, 1973 | Details |
| Bahrain | | Accession: November 29, 1996 | March 2, 1997 | Details |
| Bangladesh | | Accession: February 4, 1999 | May 4, 1999 | Details |
| Barbados | | Accession: March 16, 1983 | July 30, 1983 | Details |
| Belarus | | Accession: September 12, 1997 | December 12, 1997 | Details |
| Belgium | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 | Details |
| Belize | | Accession: March 17, 2000 | June 17, 2000 | Details |
| Benin | | Declaration of Continued Application: January 3, 1961 | August 1, 1960 | Details |
| Bhutan | | Accession: August 25, 2004 | November 25, 2004 | Details |
| Bolivia (Plurinational State of) | | Accession: August 4, 1993 | November 4, 1993 | Details |
| Bosnia and Herzegovina | | Declaration of Continued Application: June 2, 1993 | March 1, 1992 | Details |
| Botswana | | Accession: January 15, 1998 | April 15, 1998 | Details |
| Brazil | | Accession: February 6, 1922 | February 9, 1922 | Details |
| Brunei Darussalam | | Accession: May 30, 2006 | August 30, 2006 | Details |
| Bulgaria | | Accession: December 5, 1921 | December 5, 1921 | Details |
| Burkina Faso | | Accession: April 26, 1963 | August 19, 1963 | Details |
| Burundi | | Accession: January 12, 2016 | April 12, 2016 | Details |
| Cabo Verde | | Accession: April 7, 1997 | July 7, 1997 | Details |
| Cameroon | | Declaration of Continued Application: September 21, 1964 | January 1, 1960 | Details |
| Canada | | Declaration of Continued Application: April 10, 1928 | April 10, 1928 | Details |
| Central African Republic | | Accession: May 31, 1977 | September 3, 1977 | Details |
| Chad | | Accession: August 4, 1971 | November 25, 1971 | Details |
| Chile | | Accession: April 9, 1970 | June 5, 1970 | Details |
| China | | Accession: July 10, 1992 | October 15, 1992 | Details |
| Colombia | | Accession: December 4, 1987 | March 7, 1988 | Details |
| Comoros | | Accession: January 17, 2005 | April 17, 2005 | Details |
| Congo | | Declaration of Continued Application: May 8, 1962 | August 15, 1960 | Details |
| Costa Rica | | Accession: March 3, 1978 | June 10, 1978 | Details |
| Côte d'Ivoire | | Accession: July 8, 1961 | January 1, 1962 | Details |
| Croatia | | Declaration / Notification of Succession: July 28, 1992 | October 8, 1991 | Details |
| Cuba | | Accession: November 20, 1996 | February 20, 1997 | Details |
| Cyprus | | Declaration of Continued Application: February 24, 1964 | August 16, 1960 | Details |
| Czech Republic | | Declaration of Continued Application: December 18, 1992 | January 1, 1993 | Details |
| Democratic People's Republic of Korea | | Accession: January 28, 2003 | April 28, 2003 | Details |
| Democratic Republic of the Congo | | Declaration of Continued Application: October 8, 1963 | June 30, 1960 | Details |
| Denmark | | Accession: June 13, 1903 | July 1, 1903 | Details |
| Djibouti | | Accession: February 13, 2002 | May 13, 2002 | Details |
| Dominica | | Accession: May 7, 1999 | August 7, 1999 | Details |
| Dominican Republic | | Accession: September 24, 1997 | December 24, 1997 | Details |
| Ecuador | | Accession: July 8, 1991 | October 9, 1991 | Details |
| Egypt | | Accession: March 2, 1977 | June 7, 1977 | Details |
| El Salvador | | Accession: November 18, 1993 | February 19, 1994 | Details |
| Equatorial Guinea | | Accession: March 26, 1997 | June 26, 1997 | Details |
| Estonia | | Accession: July 26, 1994 | October 26, 1994 | Details |
| Fiji | | Declaration of Continued Application: December 1, 1971 | October 10, 1970 | Details |
| Finland | | Accession: March 23, 1928 | April 1, 1928 | Details |
| France | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 | Details |
| Gabon | | Accession: December 19, 1961 | March 26, 1962 | Details |
| Gambia | | Accession: December 7, 1992 | March 7, 1993 | Details |
| Georgia | | Accession: February 16, 1995 | May 16, 1995 | Details |
| Germany | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 | Details |
| Ghana | | Accession: July 11, 1991 | October 11, 1991 | Details |
| Greece | | Accession: November 9, 1920 | November 9, 1920 | Details |
| Grenada | | Accession: June 22, 1998 | September 22, 1998 | Details |
| Guatemala | | Accession: April 28, 1997 | July 28, 1997 | Details |
| Guinea | | Accession: August 13, 1980 | November 20, 1980 | Details |
| Guinea-Bissau | | Accession: April 18, 1991 | July 22, 1991 | Details |
| Guyana | | Accession: July 25, 1994 | October 25, 1994 | Details |
| Haiti | | Accession: October 11, 1995 | January 11, 1996 | Details |
| Holy See | | Accession: July 19, 1935 | September 12, 1935 | Details |
| Honduras | | Accession: October 24, 1989 | January 25, 1990 | Details |
| Hungary | | Accession: February 14, 1922 | February 14, 1922 | Details |
| Iceland | | Accession: June 30, 1947 | September 7, 1947 | Details |
| India | | Declaration of Continued Application: April 23, 1928 | April 1, 1928 | Details |
| Indonesia | | Accession: June 5, 1997 | September 5, 1997 | Details |
| Ireland | | Accession: October 5, 1927 | October 5, 1927 | Details |
| Israel | | Accession: December 14, 1949 | March 24, 1950 | Details |
| Italy | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 | Details |
| Jamaica | | Accession: September 28, 1993 | January 1, 1994 | Details |
| Japan | | Accession: April 18, 1899 | July 15, 1899 | Details |
| Jordan | | Accession: April 28, 1999 | July 28, 1999 | Details |
| Kazakhstan | | Accession: January 12, 1999 | April 12, 1999 | Details |
| Kenya | | Accession: March 11, 1993 | June 11, 1993 | Details |
| Kuwait | | Accession: September 2, 2014 | December 2, 2014 | Details |
| Kyrgyzstan | | Accession: April 8, 1999 | July 8, 1999 | Details |
| Lao People's Democratic Republic | | Accession: December 14, 2011 | March 14, 2012 | Details |
| Latvia | | Accession: May 11, 1995 | August 11, 1995 | Details |
| Lebanon | | Accession: February 19, 1946 | September 30, 1947 | Details |
| Lesotho | | Accession: June 27, 1989 | September 28, 1989 | Details |
| Liberia | | Accession: December 8, 1988 | March 8, 1989 | Details |
| Libya | | Accession: June 28, 1976 | September 28, 1976 | Details |
| Liechtenstein | | Accession: July 20, 1931 | July 30, 1931 | Details |
| Lithuania | | Accession: September 14, 1994 | December 14, 1994 | Details |
| Luxembourg | | Accession: June 20, 1888 | June 20, 1888 | Details |
| Madagascar | | Declaration of Continued Application: February 11, 1966 | January 1, 1966 | Details |
| Malawi | | Accession: July 12, 1991 | October 12, 1991 | Details |
| Malaysia | | Accession: June 28, 1990 | October 1, 1990 | Details |
| Mali | | Declaration of Continued Application: March 19, 1962 | March 19, 1962 | Details |
| Malta | | Declaration of Continued Application: May 29, 1968 | September 21, 1964 | Details |
| Mauritania | | Accession: October 16, 1972 | February 6, 1973 | Details |
| Mauritius | | Accession: February 9, 1989 | May 10, 1989 | Details |
| Mexico | | Accession: May 9, 1967 | June 11, 1967 | Details |
| Micronesia (Federated States of) | | Accession: July 7, 2003 | October 7, 2003 | Details |
| Monaco | | Accession: May 30, 1889 | May 30, 1889 | Details |
| Mongolia | | Accession: December 12, 1997 | March 12, 1998 | Details |
| Montenegro | | Declaration of Continued Application: December 4, 2006 | June 3, 2006 | Details |
| Morocco | | Accession: June 16, 1917 | June 16, 1917 | Details |
| Mozambique | | Accession: August 22, 2013 | November 22, 2013 | Details |
| Namibia | | Declaration of Continued Application: September 21, 1993 | March 21, 1990 | Details |
| Nepal | | Accession: October 11, 2005 | January 11, 2006 | Details |
| Netherlands | | Accession: October 9, 1912 | November 1, 1912 | Details |
| New Zealand | | Declaration of Continued Application: April 26, 1928 | April 24, 1928 | Details |
| Nicaragua | | Accession: May 23, 2000 | August 23, 2000 | Details |
| Niger | | Declaration of Continued Application: May 2, 1962 | August 3, 1960 | Details |
| Nigeria | | Accession: June 10, 1993 | September 14, 1993 | Details |
| Niue | | Accession: June 24, 2016 | September 24, 2016 | Details |
| Norway | | Accession: April 13, 1896 | April 13, 1896 | Details |
| Oman | | Accession: April 14, 1999 | July 14, 1999 | Details |
| Pakistan | | Accession: June 4, 1948 | July 5, 1948 | Details |
| Panama | | Accession: March 8, 1996 | June 8, 1996 | Details |
| Paraguay | | Accession: September 9, 1991 | January 2, 1992 | Details |
| Peru | | Accession: May 20, 1988 | August 20, 1988 | Details |
| Philippines | | Accession: June 29, 1950 | August 1, 1951 | Details |
| Poland | | Accession: January 28, 1920 | January 28, 1920 | Details |
| Portugal | | Accession: March 29, 1911 | March 29, 1911 | Details |
| Qatar | | Accession: April 5, 2000 | July 5, 2000 | Details |
| Republic of Korea | | Accession: May 21, 1996 | August 21, 1996 | Details |
| Republic of Moldova | | Accession: August 1, 1995 | November 2, 1995 | Details |
| Romania | | Accession: August 28, 1926 | January 1, 1927 | Details |
| Russian Federation | | Accession: December 9, 1994 | March 13, 1995 | Details |
| Rwanda | | Accession: November 3, 1983 | March 1, 1984 | Details |
| Saint Kitts and Nevis | | Accession: January 3, 1995 | April 9, 1995 | Details |
| Saint Lucia | | Accession: May 21, 1993 | August 24, 1993 | Details |
| Saint Vincent and the Grenadines | | Accession: May 29, 1995 | August 29, 1995 | Details |
| Samoa | | Accession: April 21, 2006 | July 21, 2006 | Details |
| Sao Tome and Principe | | Accession: March 14, 2016 | June 14, 2016 | Details |
| Saudi Arabia | | Accession: December 11, 2003 | March 11, 2004 | Details |
| Senegal | | Accession: June 30, 1962 | August 25, 1962 | Details |
| Serbia | | Declaration of Continued Application: September 19, 2006 | April 27, 1992 | Details |
| Singapore | | Accession: September 21, 1998 | December 21, 1998 | Details |
| Slovakia | | Declaration of Continued Application: December 30, 1992 | January 1, 1993 | Details |
| Slovenia | | Declaration of Continued Application: June 12, 1992 | June 25, 1991 | Details |
| South Africa | | Declaration of Continued Application: October 3, 1928 | October 3, 1928 | Details |
| Spain | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 | Details |
| Sri Lanka | | Declaration of Continued Application: July 20, 1959 | February 4, 1948 | Details |
| Sudan | | Accession: September 28, 2000 | December 28, 2000 | Details |
| Suriname | | Accession: November 16, 1976 | February 23, 1977 | Details |
| Swaziland | | Accession: September 14, 1998 | December 14, 1998 | Details |
| Sweden | | Accession: July 8, 1904 | August 1, 1904 | Details |
| Switzerland | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 | Details |
| Syrian Arab Republic | | Accession: March 11, 2004 | June 11, 2004 | Details |
| Tajikistan | | Accession: December 9, 1999 | March 9, 2000 | Details |
| Thailand | | Accession: June 17, 1931 | July 17, 1931 | Details |
| the former Yugoslav Republic of Macedonia | | Declaration / Notification of Succession: July 23, 1993 | September 8, 1991 | Details |
| Togo | | Accession: January 28, 1975 | April 30, 1975 | Details |
| Tonga | | Accession: March 14, 2001 | June 14, 2001 | Details |
| Trinidad and Tobago | | Accession: May 16, 1988 | August 16, 1988 | Details |
| Tunisia | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 | Details |
| Turkey | | Accession: October 27, 1951 | January 1, 1952 | Details |
| Turkmenistan | | Accession: February 29, 2016 | May 29, 2016 | Details |
| Ukraine | | Accession: July 25, 1995 | October 25, 1995 | Details |
| United Arab Emirates | | Accession: April 14, 2004 | July 14, 2004 | Details |
| United Kingdom | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 | Details |
| United Republic of Tanzania | | Accession: April 25, 1994 | July 25, 1994 | Details |
| United States of America | | Accession: November 16, 1988 | March 1, 1989 | Details |
| Uruguay | | Accession: June 7, 1967 | July 10, 1967 | Details |
| Uzbekistan | | Accession: January 19, 2005 | April 19, 2005 | Details |
| Vanuatu | | Accession: September 27, 2012 | December 27, 2012 | Details |
| Venezuela (Bolivarian Republic of) | | Accession: September 20, 1982 | December 30, 1982 | Details |
| Viet Nam | | Accession: July 26, 2004 | October 26, 2004 | Details |
| Yemen | | Accession: April 14, 2008 | July 14, 2008 | Details |
| Zambia | | Accession: September 13, 1991 | January 2, 1992 | Details |
| Zimbabwe | | Declaration / Notification of Succession: September 18, 1981 | April 18, 1980 | Details |
