Choose from over 200 specific Operating Systems to target, see the full list here: Operating Systems

Operating System targeting can be used, but does come with some limitations. Due to inconsistent naming conventions used by app providers and mobile carriers, OS targeting methods for mobile apps are only available for a small portion of inventory, so targeting these may significantly limit scale. A significant portion of impressions are also from unknown browsers and operating systems, so it is recommended to include ‘Unknown’ to avoid excluding these impressions.