| Country | Action | Action Date | Effective Date |
|---|
| ALGERIA | Signature | 20/04/1972 | |
| All Territories under UK Sovereignty | Extension | 09/10/1973 | |
| Antigua | Extension | 09/10/1973 | |
| ANTIGUA AND BARBUDA | Succession | 26/01/1989 | 01/11/1981 |
| ARGENTINA | Signature | 05/04/1972 | |
| ARGENTINA | Ratification | 14/11/1986 | |
| Aruba | Extension | 01/01/1986 | |
| AUSTRALIA | Accession | 20/01/1975 | |
| AUSTRIA | Signature | 30/05/1972 | |
| AUSTRIA | Ratification | 10/01/1980 | |
| AUSTRIA | Declaration | 10/01/1980 | |
| BELGIUM | Signature | 29/03/1972 | |
| BELGIUM | Ratification | 13/08/1976 | |
| Berlin West | Extension | 18/12/1975 | |
| BRAZIL | Signature | 13/07/1972 | |
| BRAZIL | Ratification | 09/03/1973 | |
| British Solomon Islands | Extension | 09/10/1973 | |
| Brunei | Extension | 09/10/1973 | |
| BULGARIA | Signature | 29/03/1972 | |
| BULGARIA | Ratification | 16/05/1972 | |
| CANADA | Accession | 20/02/1975 | |
| CANADA | Declaration | 20/02/1975 | |
| CHINA P R | Accession | 20/12/1988 | |
| CHINA P R | Statement | 20/12/1988 | |
| COLOMBIA | Ratification | 02/07/2014 | 02/07/2014 |
| CYPRUS | Signature | 28/04/1972 | |
| CYPRUS | Ratification | 15/05/1973 | |
| CZECH REPUBLIC | Succession | 29/09/1993 | 01/01/1993 |
| CZECHOSLOVAKIA | Signature | 29/03/1972 | |
| CZECHOSLOVAKIA | Ratification | 09/09/1976 | |
| DENMARK | Signature | 19/04/1972 | |
| DENMARK | Ratification | 01/04/1977 | |
| DENMARK | Declaration | 01/04/1977 | |
| Dominica | Extension | 09/10/1973 | 01/01/1900 |
| EGYPT | Signature | 06/06/1972 | |
| EL SALVADOR | Signature | 29/03/1972 | 29/03/1972 |
| EL SALVADOR | Ratification | 11/07/2016 | 11/07/2016 |
| EUROPEAN ORG FOR THE EXPLOITATION OF METEOROLOGICAL SATELLITES | Acceptance | 29/09/2005 | 29/09/2005 |
| EUROPEAN SPACE AGENCY | Acceptance | 23/09/1976 | |
| EUROPEAN SPACE AGENCY | Declaration | 23/09/1976 | |
| EUTELSAT | Acceptance | 30/11/1987 | |
| FIJI | Accession | 04/05/1973 | |
| FINLAND | Signature | 29/03/1972 | |
| FINLAND | Ratification | 01/02/1977 | |
| FRANCE | Accession | 31/12/1975 | |
| GABON | Accession | 05/02/1982 | |
| GAMBIA THE | Signature | 08/08/1972 | |
| GERMANY FEDERAL REPUBLIC | Accession | 18/12/1975 | |
| GERMANY FEDERAL REPUBLIC | Declaration | 18/12/1975 | |
| GREECE | Ratification | 04/05/1977 | |
| Grenada | Extension | 09/10/1973 | 01/01/1900 |
| HONG KONG SAR | Application | 05/06/1997 | 01/07/1997 |
| HUNGARY | Signature | 29/03/1972 | |
| HUNGARY | Ratification | 27/12/1972 | |
| ICELAND | Signature | 29/03/1972 | |
| INDIA | Accession | 09/07/1979 | |
| INDONESIA | Accession | 09/05/1996 | |
| IRAN | Signature | 29/03/1972 | |
| IRAN | Ratification | 21/02/1974 | |
| IRELAND, REPUBLIC OF | Signature | 29/03/1972 | |
| IRELAND, REPUBLIC OF | Ratification | 29/06/1972 | |
| IRELAND, REPUBLIC OF | Declaration | 29/06/1972 | |
| ISRAEL | Accession | 23/06/1977 | |
| ITALY | Signature | 14/04/1972 | |
| ITALY | Ratification | 22/02/1983 | |
| JAPAN | Accession | 20/06/1983 | |
| KOREA REPUBLIC OF | Signature | 29/03/1972 | |
| KOREA REPUBLIC OF | Reservation | 29/03/1972 | |
| KUWAIT | Signature | 20/06/1972 | |
| KUWAIT | Ratification | 30/10/1972 | |
| KUWAIT | Declaration | 30/10/1972 | |
| LAOS | Signature | 29/03/1972 | |
| LAOS | Ratification | 25/04/1973 | |
| LEBANON | Signature | 29/03/1972 | |
| LEBANON | Ratification | 23/05/2006 | 23/05/2006 |
| LIBYA | Accession | 20/04/2010 | 20/04/2010 |
| LIECHTENSTEIN | Accession | 09/01/1980 | |
| LUXEMBOURG | Signature | 27/04/1972 | |
| LUXEMBOURG | Ratification | 18/10/1983 | |
| MALTA | Accession | 13/01/1978 | |
| MEXICO | Signature | 29/03/1972 | |
| MEXICO | Ratification | 08/04/1974 | |
| MONGOLIA | Signature | 29/03/1972 | |
| MONGOLIA | Ratification | 14/09/1972 | |
| MONTENEGRO | Succession | 12/12/2006 | 03/06/2006 |
| MOROCCO | Signature | 04/04/1972 | |
| NEPAL | Signature | 29/03/1972 | |
| Netherlands Antilles | Extension | 17/02/1981 | |
| NETHERLANDS THE | Accession | 17/02/1981 | |
| NETHERLANDS THE | Declaration | 17/02/1981 | |
| NEW ZEALAND | Signature | 19/06/1972 | |
| NEW ZEALAND | Ratification | 30/10/1974 | |
| NEW ZEALAND | Declaration | 30/10/1974 | |
| NICARAGUA | Signature | 11/04/1972 | |
| NICARAGUA | Ratification | 14/08/2017 | 14/08/2017 |
| NIGERIA | Accession | 21/12/2005 | 21/12/2005 |
| NORWAY | Signature | 29/03/1972 | |
| OMAN | Signature | 23/06/1972 | |
| OMAN | Ratification | 04/02/2022 | |
| PAKISTAN | Signature | 06/07/1972 | |
| PAKISTAN | Ratification | 10/04/1973 | |
| PANAMA | Signature | 29/03/1972 | |
| PAPUA NEW GUINEA | Succession | 27/10/1980 | |
| PARAGUAY | Accession | 11/07/2023 | |
| POLAND | Signature | 29/03/1972 | |
| POLAND | Ratification | 25/01/1973 | |
| PORTUGAL | Accession | 27/06/2019 | 27/06/2019 |
| QATAR | Accession | 11/01/1974 | |
| ROMANIA | Signature | 29/03/1972 | |
| ROMANIA | Ratification | 18/03/1980 | |
| SEYCHELLES | Accession | 05/01/1978 | |
| SINGAPORE | Signature | 19/07/1972 | |
| SINGAPORE | Ratification | 19/08/1975 | |
| SLOVAK REPUBLIC | Succession | 07/04/2006 | 01/01/1993 |
| SLOVENIA | Succession | 27/05/1992 | |
| SOUTH AFRICA | Ratification | 14/12/2011 | |
| SOVIET UNION | Signature | 29/03/1972 | |
| SOVIET UNION | Ratification | 09/10/1973 | |
| SOVIET UNION | Objection | 05/08/1976 | |
| SRI LANKA | Accession | 03/05/1973 | |
| St Christopher, Nevis and Anguilla | Extension | 09/10/1973 | |
| St Lucia | Extension | 09/10/1973 | |
| St Vincent | Extension | 09/10/1973 | |
| ST VINCENT AND THE GRENADINES | Accession | 13/05/1999 | 13/05/1999 |
| SWEDEN | Accession | 15/06/1976 | |
| SWEDEN | Declaration | 15/06/1976 | |
| SWITZERLAND | Signature | 29/03/1972 | |
| SWITZERLAND | Ratification | 22/01/1974 | |
| TUNISIA | Signature | 06/04/1972 | |
| TUNISIA | Ratification | 06/06/1973 | |
| TURKEY | Accession | 15/02/2007 | 15/02/2007 |
| TURKEY | Declaration | 15/02/2007 | 15/02/2007 |
| UNITED KINGDOM | Signature | 29/03/1972 | |
| UNITED KINGDOM | Ratification | 09/10/1973 | |
| UNITED KINGDOM | Extension | 09/10/1973 | |
| UNITED KINGDOM | Notification | 19/06/1997 | 01/07/1997 |
| UNITED STATES OF AMERICA | Signature | 29/03/1972 | |
| UNITED STATES OF AMERICA | Ratification | 09/10/1973 | |
| VENEZUELA | Ratification | 01/08/1978 | |
| YUGOSLAVIA | Accession | 20/10/1975 | |
| ZAMBIA | Accession | 28/08/1973 | |