Ad-tech supply chain

The third-party ad networks, trackers and payment processors each site loads, and the declared supply-chain partners from ads.txt / sellers.json.

How it’s collected

The rendered page’s third-party requests are captured with a real browser and classified against a vendor catalog; ads.txt and sellers.json are parsed for declared relationships.

Known limits

• A rendered snapshot captures what loaded on that visit; it is not an exhaustive list of every partner.
• Classification only names vendors in our catalog; unclassified hosts are not attributed.

See it in use: Ad-tech. Download: open data. Found an error? How we handle corrections.

Every figure in this dataset is drawn from the source above and dated. This is measured, first-party data — where a number is an estimate it is labelled as one. This site is in development.