UN Secretary-General Antonio Guterres warned however in the report to the Security Council that IS jihadists continue to pose a grave threat and are "partially adapting" to losses on the battlefield.
"ISIL is militarily on the defensive in several regions, notably in Afghanistan, Iraq, Libya and the Syrian Arab Republic," said the report sent to the council on Thursday.
IS finances are on a decline, forcing the militant group to operate on a "crisis budget," it added.
The report urged governments to be vigilant of IS efforts to find new revenue streams, citing concerns that journalists and aid workers travelling to areas recaptured from the jihadists could be targets for kidnapping.
The flow of foreign fighters to Iraq and Syria has slowed considerably, because of security measures taken by governments and also due to the "diminished attractiveness" of the group, said the report.
Several member-states are reporting that many hardened foreign fighters will remain in Iraq and Syria as most of those who intended to leave have already done so.
The council will meet Tuesday to discuss the report as President Donald Trump has ordered US generals to draw up a new plan to defeat the radical extremists.
Iraqi forces are making strides in their offensive to drive the Islamic State from Mosul, the country's second city seized in 2014 and proclaimed as the capital of a caliphate stretching into Syria.
In response to the military pressure, IS communication and recruitment "are increasingly moving towards more covert methods, such as the use of the dark web, encryption and messengers," said the report.
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