However, diplomats familiar with the report cautioned that the country is keeping thousands of machines that could be used for such a purpose on standby.
The UN's International Atomic Energy Agency report and the diplomats' assessments present a mixed picture of the pace of Iran's moves to comply with the July 14 deal it signed with the six countries and come about a month after the deal was adopted on October 18.
It said 11,308 centrifuges were standing at Iran's main enrichment center as of November 15 - over 3,000 fewer than before adoption day for the deal.
It also noted reductions at a smaller facility.
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But the diplomats said all of the machines that have been taken out were idle.
The thousands of centrifuges that were spinning uranium into enriched levels used for fuel are no longer online but remain on standby and can be restarted at short notice.