Block List

List of excluded domains/apps A working definition from the RGM marketing glossary.

Schematic — Block List

List of excluded domains/apps

Term: Block List
Field: Programmatic
Category: Programmatic

What it means

Hold that thought.Block List is an auction-based concept. Fix what it covers before the team debates tactics, and the rest of the conversation gets easier.

List of excluded domains/apps

Programmatic refers to automated buying and selling of digital advertising using software, exchanges, and real-time bidding. The ecosystem includes DSPs, SSPs, ad exchanges, data providers, and verification vendors.

Block List belongs to Programmatic and refers to an auction-based concept. A shared definition keeps the team aligned.

How it works

Hold that thought.There is no single setting for Block List. It bends to the audience, the channels, and the wider plan.

Block List behaves unlike a fixed rule. An early-stage brand and a mature one will apply Block List on different terms. The mechanics follow the inputs around it. Treat Block List as a buzzword and the reporting misleads; agree on it and the numbers hold.

Keep the order simple: define Block List for your context, then decide how to act. Reverse it and the budget chases a number nobody agreed on. Start here.

The decisions it touches

One idea, plainly put.Bring Block List in when a live call depends on it. With no decision on the table, it stays background.

Bring Block List in when a live choice hangs on it. In programmatic work, that usually means one of three moments. Away from a decision, Block List is background, not a lever.

Setting budget. Block List guides the team toward the better-paying line.
Choosing a metric. Block List shows whether the report will hold up.
Comparing options. Block List normalizes a side-by-side that hides real gaps.

A worked example

Look at it this way.Below, Block List is put inside a Walmart Connect setting -- real trade-offs, a clear baseline, and a figure to test it.

Look at Walmart Connect. In a retail-media auction test, Block List drove the decision rather than sitting in a footnote. A baseline came first, then a single agreed meaning of Block List, then the read: incremental ROAS read 1.8x, not the 4x last-click claimed.

Worked example for Block List -- illustrative figures, RGM analysis
Stage	The step taken	What it bought
Baseline	Took a before reading on Block List.	A fixed point of truth.
Define	Locked the scope of Block List so it stayed stable.	A shared definition up front.
Act	A retail-media auction test — one variable.	Cause and effect, isolated.
Result	Incremental ROAS read 1.8x, not the 4x last-click claimed	An outcome you can trust.

These Block List numbers are illustrative -- RGM analysis. The structure travels; the specific figures do not.

Where teams go wrong

Read that twice.Teams slip on Block List in four familiar ways. Each makes a soft assumption look like a precise number.

One-size thinking. Using Block List flat across every segment. The right cut differs by channel and margin.
No anchor. Quoting Block List without a starting point. Always pair it with a baseline.
Vanity focus. Gaming Block List instead of the result. Tie it to business value.
Bad compares. Benchmarking Block List with no adjustment. Account for the model differences first.

Frequently asked questions

What is Block List?

List of excluded domains/apps In short, fix that meaning before any tactic is debated.

Why does Block List matter for marketers?

Block List matters because vague vocabulary breaks strategy. A precise, shared definition keeps a team aligned.

Where does Block List get used?

Block List supports a real choice: where money goes, what gets measured, which option wins. The Walmart Connect case traces it.

What is the most common mistake with Block List?

Treating Block List as one blanket rule and reporting it with no baseline. Both hide a soft assumption.

Where can I learn more about Block List?

Begin with the linked terms below, then study how the Vickrey auction works, plus performance marketing fundamentals.

What is Block List?: List of excluded domains/apps In short, fix that meaning before any tactic is debated.
Why does Block List matter for marketers?: Block List matters because vague vocabulary breaks strategy. A precise, shared definition keeps a team aligned.
Where does Block List get used?: Block List supports a real choice: where money goes, what gets measured, which option wins. The Walmart Connect case traces it.