Treaty of Tlatelolco:

OPANAL Secretariat

http://www.opanal.org/en/directory/

Rarotonga Treaty:

Pacific Islands Forum Secretariat

https://www.forumsec.org/contact-us/

Bangkok Treaty:

ASEAN Secretariat

https://asean.org/

Pelindaba Treaty:

African Commission on Nuclear Energy (AFCONE)

https://www.afcone.org/contact/

CANWFZ Treaty:

Rotational chairmanship (current Chair: Kyrgyz Republic)

https://mfa.gov.kg/en