Indexing 523,256 unique publisher IDs authorizing 2,955 advertising systems
A publisher ID is the identifier associated with a publisher's account on an advertising system. This is the value used in OpenRTB bid requests in the field specified by SSP/exchange.
Publisher ID can be any string of letters, numbers, and symbols. All Google Adsense publisher IDs start with "pub-" which makes them easily recognizable.
This section is great for performing competitive analysis. If you know one of your competitor's domains, you can find their publisher ID. Then you can search by publisher ID to find their other domains.