Snapshot of the Comprehensive Nuclear Test Ban Treaty Title Comprehensive Nuclear Test Ban Treat (CTBT) Parties 185 signed. 170 ratified Signatories Adopted 10 September 1996 Opened for signature 24 September 1996 Not in force The treaty requires ratification by all Annex 2 countries Status of ratification Subject The ban of all nuclear explosions Status of the Treaty The treaty cannot come into force until it is ratified by the Annex 2 States listed below. These are States that took part in the negotiation of the CTBT from 1994–96 and that had nuclear power or research reactors at the time. Annex 2 States Algeria, Argentina, Australia, Austria, Bangladesh, Belgium, Brazil, Bulgaria, Canada, Chile, China, Colombia, Democratic People's Republic of Korea, Egypt, Finland, France, Germany, Hungary, India, Indonesia, Iran (Islamic Republic of), Israel, Italy, Japan, Mexico, Netherlands, Norway, Pakistan, Peru, Poland, Romania, Republic of Korea, Russian Federation, Slovakia, South Africa, Spain, Sweden, Switzerland, Turkey, Ukraine, United Kingdom of Great Britain and Northern Ireland, United States