| Country | Action | Action Date | Effective Date |
|---|
| Antigua | Extension | 03/12/1968 | |
| ANTIGUA AND BARBUDA | Succession | 26/01/1989 | 01/11/1981 |
| ARGENTINA | Signature | 02/05/1968 | |
| ARGENTINA | Ratification | 26/03/1969 | |
| Aruba | Extension | 01/01/1986 | 01/01/1986 |
| AUSTRALIA | Signature | 22/04/1968 | |
| AUSTRALIA | Ratification | 18/03/1986 | |
| AUSTRIA | Signature | 22/04/1968 | |
| AUSTRIA | Ratification | 19/02/1970 | |
| BAHAMAS | Succession | 11/08/1976 | 10/07/1973 |
| BARBADOS | Accession | 20/02/1969 | |
| BELGIUM | Signature | 14/08/1968 | |
| BELGIUM | Ratification | 15/04/1977 | |
| BOTSWANA | Accession | 18/04/1969 | |
| BRAZIL | Accession | 27/02/1973 | |
| British Solomon Islands | Extension | 03/12/1968 | |
| Brunei | Extension | 03/12/1968 | |
| BULGARIA | Signature | 22/04/1968 | |
| BULGARIA | Ratification | 14/04/1969 | |
| BURMA | Signature | 21/08/1968 | |
| CAMEROON | Signature | 22/04/1968 | |
| CAMEROON | Ratification | 10/01/1969 | |
| CANADA | Signature | 25/04/1968 | |
| CANADA | Ratification | 20/02/1975 | |
| Caribbean part of the Netherlands | Extension | 10/10/2010 | |
| CHILE | Signature | 22/04/1968 | |
| CHINA P R | Accession | 20/12/1988 | |
| CHINA P R | Statement | 20/12/1988 | |
| CHINA P R | Communication | 13/09/1999 | 20/12/1999 |
| CONGO, DEMOCRATIC REPUBLIC OF | Signature | 25/06/1968 | |
| Curacao | Extension | 10/10/2010 | |
| CYPRUS | Signature | 07/05/1968 | |
| CYPRUS | Ratification | 17/12/1970 | |
| CZECH REPUBLIC | Succession | 29/09/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Signature | 22/04/1968 | |
| CZECHOSLOVAKIA | Ratification | 18/02/1969 | |
| DENMARK | Signature | 22/04/1968 | |
| DENMARK | Ratification | 06/05/1969 | |
| Dominica | Extension | 03/12/1968 | |
| EGYPT | Signature | 10/05/1968 | |
| EUROPEAN ORG FOR THE EXPLOITATION OF METEOROLOGICAL SATELLITES | Accession | 29/09/2005 | 29/09/2005 |
| EUROPEAN SPACE AGENCY | Acceptance | 25/06/1975 | 31/12/1975 |
| EUROPEAN SPACE AGENCY | Declaration | 25/06/1975 | 31/12/1975 |
| FIJI | Succession | 14/08/1972 | 10/10/1970 |
| FINLAND | Signature | 22/04/1968 | |
| FRANCE | Accession | 31/12/1975 | |
| GAMBIA THE | Accession | 02/08/1968 | |
| GERMANY FEDERAL REPUBLIC | Signature | 20/08/1968 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 17/02/1972 | |
| GHANA | Signature | 06/05/1968 | |
| GREECE | Signature | 11/06/1968 | |
| GREECE | Ratification | 07/07/1975 | |
| GRENADA | Extension | 03/12/1969 | |
| GUYANA | Signature | 04/10/1968 | |
| GUYANA | Ratification | 30/05/1969 | |
| HONG KONG SAR | Application | 05/06/1997 | 01/07/1997 |
| HUNGARY | Signature | 22/04/1968 | |
| HUNGARY | Ratification | 04/06/1969 | |
| HUNGARY | Objection | 13/09/1972 | |
| ICELAND | Signature | 22/04/1968 | |
| ICELAND | Ratification | 04/12/1969 | |
| INDIA | Accession | 09/07/1979 | |
| INDONESIA | Ratification | 27/06/1999 | |
| IRAN | Signature | 22/04/1968 | |
| IRAN | Ratification | 21/12/1970 | |
| IRAQ | Accession | 07/05/1970 | |
| IRELAND, REPUBLIC OF | Signature | 22/04/1968 | |
| IRELAND, REPUBLIC OF | Ratification | 29/08/1968 | |
| ISRAEL | Signature | 26/04/1968 | |
| ISRAEL | Ratification | 06/01/1970 | |
| ITALY | Signature | 22/04/1968 | |
| ITALY | Ratification | 31/03/1978 | |
| JAMAICA | Signature | 23/07/1968 | |
| JAPAN | Accession | 20/06/1983 | |
| JORDAN | Signature | 24/07/1968 | |
| KUWAIT | Accession | 20/06/1972 | |
| LAOS | Signature | 22/04/1968 | |
| LAOS | Ratification | 15/01/1973 | |
| LEBANON | Signature | 30/04/1968 | |
| LEBANON | Ratification | 31/03/1969 | |
| LIBYA | Accession | 20/04/2010 | 20/04/2010 |
| LUXEMBOURG | Signature | 14/08/1968 | |
| MALAYSIA | Signature | 29/07/1968 | |
| MALTA | Signature | 29/05/1968 | |
| MAURITIUS | Accession | 21/04/1969 | |
| MEXICO | Signature | 15/07/1968 | |
| MEXICO | Ratification | 11/03/1969 | |
| MONACO | Signature | 13/06/1968 | |
| MONGOLIA | Objection | 13/09/1972 | |
| MONTENEGRO | Succession | 12/12/2006 | 03/06/2006 |
| MOROCCO | Signature | 14/06/1968 | |
| MOROCCO | Ratification | 20/11/1970 | |
| NEPAL | Signature | 22/04/1968 | |
| NEPAL | Ratification | 03/02/1969 | |
| Netherlands Antilles | Extension | 17/02/1981 | |
| NETHERLANDS THE | Signature | 14/08/1968 | |
| NETHERLANDS THE | Ratification | 17/02/1981 | |
| NEW ZEALAND | Signature | 24/04/1968 | |
| NEW ZEALAND | Ratification | 08/07/1969 | |
| NICARAGUA | Signature | 13/06/1968 | |
| NICARAGUA | Ratification | 14/08/2017 | 14/08/2017 |
| NIGERIA | Signature | 26/07/1968 | |
| NIGERIA | Ratification | 23/03/1973 | |
| NORWAY | Signature | 22/04/1968 | |
| NORWAY | Ratification | 20/04/1970 | |
| OMAN | Accession | 04/02/2022 | |
| PAKISTAN | Accession | 02/11/1973 | |
| PAPUA NEW GUINEA | Accession | 27/10/1980 | |
| PARAGUAY | Accession | 26/01/2024 | |
| PERU | Accession | 03/05/1979 | |
| POLAND | Signature | 22/04/1968 | |
| POLAND | Ratification | 14/02/1969 | |
| PORTUGAL | Communication | 21/10/1999 | 20/12/1999 |
| ROMANIA | Signature | 22/04/1968 | |
| ROMANIA | Ratification | 28/06/1971 | |
| ROMANIA | Objection | 28/06/1971 | |
| SAN MARINO | Signature | 07/11/1968 | |
| SAN MARINO | Ratification | 10/08/1970 | |
| SAUDI ARABIA | Accession | 11/11/2021 | |
| SENEGAL | Signature | 26/06/1968 | |
| SEYCHELLES | Accession | 05/01/1978 | |
| SIERRA LEONE | Signature | 20/05/1968 | |
| SINGAPORE | Accession | 10/09/1976 | |
| Sint Maarten | Extension | 10/10/2010 | |
| SLOVENIA | Succession | 27/05/1992 | |
| SOUTH AFRICA | Signature | 06/08/1968 | |
| SOUTH AFRICA | Ratification | 24/09/1969 | |
| SOVIET UNION | Signature | 22/04/1968 | |
| SOVIET UNION | Ratification | 03/12/1968 | |
| SPAIN | Accession | 26/02/2001 | 26/02/2001 |
| St Kitts Nevis Anguilla | Extension | 03/12/1968 | |
| St Lucia | Extension | 03/12/1968 | |
| ST VINCENT AND THE GRENADINES | Succession | 13/05/1999 | 27/10/1979 |
| SWAZILAND | Accession | 10/06/1969 | |
| SWEDEN | Accession | 21/07/1969 | |
| SWITZERLAND | Signature | 22/04/1968 | |
| SWITZERLAND | Ratification | 18/12/1969 | |
| THAILAND | Accession | 29/05/1969 | |
| TONGA | Extension | 03/12/1968 | |
| TONGA | Succession | 07/07/1971 | 04/06/1970 |
| TUNISIA | Signature | 22/04/1968 | |
| TUNISIA | Ratification | 15/02/1971 | |
| TURKEY | Signature | 29/11/1968 | |
| TURKEY | Ratification | 19/12/2006 | 19/12/2006 |
| TURKEY | Declaration | 19/12/2006 | |
| UNITED KINGDOM | Signature | 22/04/1968 | |
| UNITED KINGDOM | Declaration | 08/05/1968 | |
| UNITED KINGDOM | Declaration | 03/12/1968 | |
| UNITED KINGDOM | Ratification | 03/12/1968 | |
| UNITED KINGDOM | Notification | 19/06/1997 | 01/07/1997 |
| UNITED STATES OF AMERICA | Signature | 22/04/1968 | |
| UNITED STATES OF AMERICA | Ratification | 03/12/1968 | |
| URUGUAY | Signature | 22/04/1968 | |
| URUGUAY | Ratification | 25/02/1969 | |
| VIETNAM | Signature | 22/05/1968 | |
| YUGOSLAVIA | Signature | 22/04/1969 | |
| YUGOSLAVIA | Ratification | 01/03/1971 | |
| ZAMBIA | Accession | 28/08/1973 | |