Defence Minister Rob Nicholson has revealed that two CF-18s conducted a pre-planned strike early Wednesday on an extremist fighting position located near Kirkuk, about 280 kilometres north of Baghdad.
The jets dropped two 907-kilogram (2,000-pound) bombs on what appear to be fortified positions.
The raid took place at the same times as other allies, notably France, were conducting concurrent air operations aimed at relieving pressure on Kurdish Peshmerga fighters near the besieged oil-rich city.
The Islamic State of Iraq and the Levant overran much of the region earlier this year.
A defence official says there were no civilian casualties and wouldn't speculate on how many extremists might have been killed.
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