Over the past six months IS had carried out attacks in 11 countries, not including its activity in Syria, Iraq, Yemen, Afghanistan and Libya, the UN reported.
There was a marked fall in the number of terror attacks around the world in 2015, the US State Department has said.
It attributed the 13% drop from 2014 to fewer attacks in Iraq, Pakistan and Nigeria, three of the five countries worst affected by terrorism.
The other two are India and Afghanistan and together more than half the 11,000 attacks occurred within their borders.
Separately, the UN warned that so-called Islamic State (IS) was focusing on international civilian targets.
