Country	First tests by nuclear weapon design
	Fission	Year	Boosted fission	Year	Multi-stage	Year	Multi-stage above one megaton	Year
United States	Trinity	1945	Greenhouse George	1951	Greenhouse George	1951	Ivy Mike	1952
Soviet Union	RDS-1	1949	RDS-6s	1953	RDS-37	1955	RDS-37	1955
United Kingdom	Operation Hurricane	1952	Mosaic G1	1956	Grapple 1	1957	Grapple X	1957
China	596	1964	596L	1966	629	1966	639	1967
France	Gerboise Bleue	1960	Rigel	1966	Canopus	1968	Canopus	1968
India	Smiling Buddha	1974	Shakti I (unconfirmed)	1998	Shakti I (unconfirmed)	1998	n/a
Pakistan	Chagai I	1998	Chagai I	1998	n/a		n/a
North Korea	#1	2006	#4 (unconfirmed)	2016	#6 (unconfirmed)	2017	n/a
Israel	See Nuclear weapons and Israel § Nuclear testing						n/a
South Africa	See South Africa and weapons of mass destruction § Nuclear weapons						n/a