The ad network that you choose must essentially offer two types of reporting. First, is the real time ad metrics - the number of ad impressions, views, fill rate, CPMs, and overall revenue. Second is user-level insights.Advertising networks collect unsold inventory from publishers and sell it to advertisers. Ad networks make money by taking a cut of the publisher's ad revenue once inventory is sold through real-time bidding.Based on the traffic on your website, audience geography, and CTR, the CPM can range between $0.30 to $2. You can utilize different ad sizes such as 300×600, 336×280, 300×250 and 160×600, etc., to get the maximum CPMs. In the case of mobile devices, publishers can use either 300×250 or 300×600 ad units.