The Reachability Number Your Onboarding Report Shows Is Not the Reachability Number That Matters for Your Campaign

When a CRM file comes back from an onboarding partner, the summary report usually leads with a single number: the percentage of records that resolved to a reachable device or cookie. If that number is 60 percent, the team logs it, compares it to a benchmark, and moves forward. The problem is that 60 percent is an average across your entire file, and averages hide the distribution that actually governs campaign performance.

Why the Overall Number Obscures the Segments That Matter

Reachability is not uniform across a customer file. Older email domains resolve at different rates than newer ones. Customers acquired through offline channels often have thinner digital footprints than customers acquired online. High-value accounts with longer purchase cycles may be concentrated in precisely the segments where identity graph coverage is thinnest. When your campaign goal is to reach a specific tier of customers, say, lapsed enterprise buyers or recently upgraded accounts, the overall reachability rate tells you almost nothing about whether those specific people are findable.

Consider a hypothetical example. A file of 200,000 records resolves at 62 percent overall. But when that file is segmented by acquisition channel, customers who came through field sales events resolve at 38 percent, while customers acquired through digital self-serve resolve at 81 percent. If the campaign is targeting the field-sales segment because those accounts represent higher contract value, the planning team is working with a population roughly half the size they assumed. The 62 percent headline was accurate and useless at the same time.

Reachability and Addressability Are Two Different Thresholds

It helps to keep two concepts separate. Reachability describes whether a record resolves to any identifier the graph can find. Addressability describes whether that identifier can be reached through a specific channel or inventory environment. A record may resolve to a device ID that a given DSP cannot bid against, or to a connected TV identifier that does not transfer to mobile display. A record may resolve successfully for email-based activation but have no match in a publisher's logged-in environment.

Most onboarding reports stop at reachability. They do not tell you how many of your resolved records are addressable through the specific path your media plan requires. That gap matters most when your plan spans multiple channels, because each channel has its own resolution logic and its own coverage patterns. A file that looks healthy in aggregate may have very different effective reach depending on whether your delivery is weighted toward programmatic display, connected TV, or social.

How to Ask Better Questions Before a Campaign Launches

The practical move is to request segment-level reachability breakdowns before a campaign is planned, not after it delivers. If your onboarding partner can produce reachability by customer tier, acquisition source, geographic region, or firmographic category, those cuts will reveal where your campaign has population to work with and where it does not.

For B2B campaigns in particular, firmographic segmentation is worth requesting explicitly. Reachability rates for individual contributor records typically differ from reachability rates for decision-maker titles. If your targeting strategy requires reaching specific job functions or seniority levels, understanding reachability within those subgroups is more useful than knowing the company-level average.

Another useful question to ask your onboarding partner is whether reachability is measured at the point of graph resolution or at the point of downstream activation. Some platforms report reachability based on whether a record found a match in the graph, and a separate system then determines whether that match can be activated in a given environment. If those two thresholds are collapsed into a single metric, you may be planning against a population that shrinks again once delivery actually begins.

The Planning Implication for Audience Sizing

If segment-level reachability data is available before media planning, it should anchor the audience size assumption your plan is built on, not the overall file size and not the overall match rate. Working backward from a realistic addressable count changes budget allocation decisions in ways that matter. It may shift impression volume targets, affect whether a campaign can run efficiently in a given channel at all, or surface the need to supplement your first-party file with additional signal before launch.

When segment-level data is not available before planning, a conservative assumption is more useful than an optimistic one. If you know from past campaigns that field-sales-acquired customers resolve at lower rates, apply that prior to your sizing model rather than using the overall rate as a universal proxy.

It is also worth revisiting reachability assumptions when your CRM file changes significantly. A file that was audited for reachability six months ago and has since been updated with new customer cohorts, re-engagement lists, or acquisition channel additions will have a different distribution than the file that was originally measured. Reachability should be treated as a property of the current file, not a standing characteristic of your customer data.

What This Changes at the Reporting Stage

When a campaign underdelivers against its target audience, segment-level reachability history is useful for diagnosis. If certain customer tiers received fewer impressions than planned, the question is whether that was a bidding and inventory issue or whether those records were never resolvable to begin with. Without segment-level reachability data from onboarding, those two causes look the same in a delivery report and require different responses.

Tracking reachability by segment over time also surfaces drift. If the share of your enterprise accounts that resolve to reachable identifiers declines across consecutive quarters, that pattern may reflect changes in how that segment uses email, changes in the identity graph's coverage, or changes in your data hygiene practices. Any of those causes is worth knowing about, and none of them are visible in an aggregate match rate.

The Takeaway for Media Buyers

A single reachability percentage on an onboarding report is a starting point, not a planning input. The number that matters for a specific campaign is the reachability rate within the customer segments your campaign is actually designed to reach. Asking for that breakdown before media planning begins is a straightforward request, and the answer will either confirm your audience sizing or reveal that your plan needs to be adjusted. Both outcomes are more useful than the alternative.