The Hwasong-15 missile that North Korea launched on Wednesday is a new type of intercontinental ballistic missile which can fly over 13,000 km (8,080 miles), a South Korean defense ministry spokesman told Reuters on Friday.
Earlier this week, Pyongyang said it had test-fired its most advanced missile, putting the U.S. mainland within range, and in violation of U.N. Security Council resolutions.
The latest provocation from the North prompted more insults from U.S. President Donald Trump, who referred to North Korea's leader Kim Jong Un as "Little Rocket Man" and a "sick puppy".
Trump had also dismissed a Chinese diplomatic effort to rein in North Korea's weapons program as a failure on Thursday, while Secretary of State Rex Tillerson said Beijing was doing a lot, but could do more to limit oil supplies to Pyongyang.
Despite international condemnation and sanctions, North Korea has continued on its path towards developing a nuclear-tipped missile that could hit the United States.