For Member States

Status of Signatures and Ratifications

See a list showing each country's status within the CTBTO including signature and ratification dates.

Facility Agreements

A facility agreement is a legal arrangement between the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) and each Member State that hosts an International Monitoring System (IMS) facility.

A facility agreement is a legal arrangement between the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) and each Member State that hosts an International Monitoring System (IMS) facility.

Expert Communication System

Applicants from States Signatories must be nominated by way of a note verbale from their Permanent Missions.

Membership Benefits

In signing and ratifying the Comprehensive Nuclear-Test-Ban Treaty (CTBT), a State joins a group of like-minded countries that are dedicated to strengthening the international nuclear non-proliferation and disarmament regime.

In signing and ratifying the Comprehensive Nuclear-Test-Ban Treaty (CTBT), a State joins a group of like-minded countries that are dedicated to strengthening the international nuclear non-proliferation and disarmament regime.

National Data Centres-for-All

National Data Centres-for-All (NDCs4All) is a forward-looking initiative by CTBTO that supports States Signatories in accessing and effectively using data from IMS and products from the IDC.

Status of Assessed Contributions

Here you can find information about States Signatories assessed payments to the organization. The information is updated on a regular basis, at least once per week.

Legal Resources

Legal resources include the text of the CTBT, Rules of Procedure of the Preparatory Commission, model facility and tsunami warning agreements, and guidance on national implementation measures.

Protocol Resources

Protocol resources include instructions on the accreditation of a new Permanent Representatives to the Preparatory Commission for the CTBTO.