A reservation system can identify available placements based on targeting criteria provided by advertisers and placement inventory data provided by publishers. The reservation system can receive reservation data for the available placements from the publishers and provide the reservation data with the available placements to the advertisers. The available placements and can be ranked and presented to the advertisers based on a first precision with which the placement can satisfy the advertiser's targeting criteria. A second precision can be determined for each placement that has enabled targeting rules. In turn, the reservation system can rank and present the placements based on the first and second precisions.