While many networks have recently begun to give their advertisers a list of the specific sites on which their messages have appeared, others do not share this information. These so-called "blind buy" networks nevertheless have a place in online advertising due to their controlled costs and undeniable ability to produce inquiries and purchases. These networks tend to be more readily accepted by hard-core direct-marketers, who focus mostly on results, and can make sense on a CPA basis because poorly placed ads can be seen as essentially free.

Examples include:
Burst Direct
RealTechNetwork
Right Media