An inclusion list is a simple idea with sharp consequences: it names the only sites, apps or placements where a campaign is allowed to run. Everything else is ineligible, no matter how cheap or relevant the impression looks. That turns automated buying upside down. Instead of filtering a nearly endless supply of inventory, the buyer starts from zero acceptable inventory and expands from there.
How the list is enforced
Inclusion lists live on the buy side, usually inside a DSP or self-serve ad platform. Before a bid is calculated, the platform checks the site domain or app identifier in the bid request against the list. A match keeps the impression alive; a miss kills it before pricing.
The matching unit matters. Most buy-side lists are keyed to domains, so example.com admits every page on that domain. Google’s Display & Video 360 allows finer controls: URL targeting reaches two levels of subdirectory and up to five levels of subdomain. DV360 also treats reusable lists as channels, each holding up to 65,000 websites or apps.
In Google Ads, placement targeting works similarly, but the rules can surprise you. When placement targeting is combined with topics or keywords in the same ad group, Google says ads can serve on content matching any of them. That makes the setup a union, not a restriction. Microsoft Advertising’s targeted website list was in open beta as of August 2025.
Why inclusion lists became the default fix
The ANA’s 2023 transparency study found programmatic campaigns ran across an average of 44,000 websites. No team can police that manually. The same study reported only 36% of post-transaction budgets reached valid, viewable, measurable impressions outside made-for-advertising sites. That made exclusion lists feel endless and inclusion lists feel decisive.
The watershed moment came in March 2017, when JPMorgan Chase cut its display activity from roughly 400,000 websites a month to about 5,000 pre-approved ones. The shift did not tank performance, according to the bank’s CMO at the time. The industry later formalized the language: the World Federation of Advertisers adopted inclusion and exclusion lists in June 2020.
What changes now
Placement controls are splitting in two directions. Fully automated products such as Performance Max still do not let buyers hand-pick placements; exclusion lists are the main lever there. At the same time, list-shaped controls are appearing in newer platforms. OpenAI’s ChatGPT ads platform targeting, documented in August 2026, functions as an inclusion list rather than a bid modifier.
Regulators are also watching. The FTC’s consent order clearing Omnicom’s acquisition of IPG, approved September 26, 2025, restricts Omnicom from using inclusion or exclusion lists to differentiate publishers on political viewpoints or editorial standards unless an individual client directs it.
How to make inclusion lists work for you
- Build lists from delivery logs and verification data, not from assumptions or a vendor’s generic default.
- Check what a domain actually contains before adding it; one registrable domain can carry both journalism and arbitrage templates.
- Layer ads.txt and sellers.json checks on top of the list. A domain name is a declaration, not a guarantee.
- Monitor concentration. Conservative lists push many buyers into the same well-known domains, which can raise prices.
- Know which products can and cannot use inclusion lists. In Performance Max, focus on account-level exclusions instead.
The strategic question is not what should we block, but who do we actually want to fund? Inclusion lists make that answer explicit. They trade reach and scale for control, and they force teams to define quality instead of continually reacting to bad placements.
Source: PPC Land
