DNC Hit Rate: What It Means and How to Vet Vendors

DNC LATAM · Compliance guides

A DNC hit rate is simply the percentage of a calling list that matched an official Do Not Call registry when checked — the count of numbers found on that registry (a “hit”), divided by the count of structurally valid numbers actually checked. It is not a quality score, a satisfaction metric, or a general “clean list” percentage, and a single combined “LATAM hit rate” across multiple countries is a red flag rather than a feature, because Mexico’s REPEP, Argentina’s Registro Nacional No Llame, and Colombia’s RNE are three separate registries with three separate answers.

That definition matters more than it looks, because “hit rate” is one of the few numbers in this category that gets thrown around loosely in vendor marketing, and a buyer who doesn’t know what the term is supposed to mean has no way to tell a rigorous result from an invented one.

The three result classes a hit rate is built from

Any DNC check on a phone number resolves to one of three classes, and only two of them belong in a hit-rate calculation at all:

  • Hit. The number is structurally valid and was found on the applicable registry at the time of the check — REPEP for Mexico, Registro Nacional No Llame for Argentina, RNE for Colombia. This is the same result class the API documentation calls prohibited_numbers_to_call.
  • Not a hit. Structurally valid and not found on that registry at the time of the check (safe_numbers_to_call). This is a statement about registry membership at that moment — not a claim that the line is active, that the contact has given consent, or that every other calling rule (hours, channel, documented opt-outs) is satisfied.
  • Invalid. The input failed structural validation or couldn’t be parsed as a number at all. Invalid inputs are not “clear to call” and they are not “on the registry” — they sit outside the hit-rate calculation entirely, in neither the numerator nor the denominator.

A hit rate, correctly computed, is hits divided by (hits plus not-a-hits) — valid numbers only. If a vendor’s reported rate moves every time they change how they’re counting invalid or unparseable numbers, that’s a sign the methodology isn’t fixed, which means the number isn’t comparable from one report to the next.

Why “one combined LATAM rate” doesn’t mean anything

Mexico, Argentina, and Colombia run independent registries with independent operators (PROFECO, AAIP, and the CRC, respectively), different release cadences, and no shared data model. A hit on REPEP says nothing about whether the same number would hit on No Llame, because they’re not the same list and a shared country code prefix tells you nothing about registry membership. For background on how the three registries actually differ — operator, access model, and refresh cadence — see Mexico vs. Argentina vs. Colombia DNC rules.

Averaging REPEP, No Llame, and RNE results into one blended “LATAM hit rate” hides which registry actually fired on a given number. A campaign calling mostly into Argentina and only lightly into Mexico could show a deceptively low blended rate that says nothing useful about REPEP exposure specifically. Country-level reporting is the only version of this number that means anything operationally, because the decision it informs — which release to re-check against, which registry’s enforcement model applies — is always a per-country decision. TCPA vs. Mexico and Argentina DNC rules covers how differently the two regimes actually enforce once a hit turns into a real complaint.

What a hit rate can’t tell you

Even a clean, correctly computed, per-country hit rate has a boundary worth being explicit about. A low hit rate — few numbers found on the registry — is not the same as a cleared campaign:

  • It’s a point-in-time snapshot. A number not on the registry during today’s check could register tomorrow. Mexico’s REPEP releases on a roughly 15-day cycle; Argentina’s registry expects a current consult rather than a static file. A hit rate from last month’s scrub describes last month’s registry state, not today’s.
  • It doesn’t cover consent, hours, or channel. A “not a hit” result only means the number wasn’t on that specific registry at that specific time. It says nothing about whether a documented opt-out exists for that contact, whether the call falls inside permitted calling hours, or whether the channel (voice versus SMS) is separately in scope. What a DNC compliance certificate actually documents walks through the gap between a screening record and the rest of a compliance floor.
  • It doesn’t substitute for a US scrub on US numbers. A hit rate against REPEP, No Llame, or RNE says nothing about FTC National DNC or TCPA status on a +1 number, and the reverse is equally true — a clean US scrub tells you nothing about Mexico or Argentina exposure. See US National DNC vs. LATAM official registries for why those two checks don’t overlap at all.

How to read a vendor’s claimed hit rate

A few direct questions separate a sourced number from a marketing one:

  1. Which registry, specifically? “LATAM clean list” or “DNC match rate” with no named registry is not a verifiable claim. Ask for REPEP, No Llame, or RNE by name.
  2. What’s excluded from the denominator? If invalid or unparseable numbers are quietly folded into the “not a hit” bucket, the rate looks better than the actual registry match. The denominator should be valid numbers only.
  3. What’s the sample size and the window? A rate computed from one small campaign, or from a sample collected months before the registry’s last release, is not representative of today’s exposure.
  4. Is it being averaged across countries? If the number offered is a single blended figure across Mexico, Argentina, and Colombia, ask for the per-country breakdown before trusting it.

A vendor that can’t answer the first two questions plainly is reporting a marketing number, not a measured one. The honest answer to “what’s your current hit rate” is sometimes “we don’t have a large enough sample to publish one yet” — a dataset that’s still collecting is a more trustworthy signal than a round, confident-sounding percentage with no stated source. Official LATAM DNC hit rates: methodology first documents exactly this distinction, country by country, including why DNC LATAM’s own tables stay marked N/A until there’s a sample worth publishing.

The takeaway

A hit rate is a narrow, specific number: the share of valid, checked phone numbers found on one country’s official registry at one point in time. It’s useful precisely because it’s narrow — anyone offering a single blended percentage across multiple countries, or unable to say which registry and which window it covers, is giving you a number that can’t actually be checked. When evaluating list-scrubbing claims for outbound into Mexico or Argentina, ask for the registry, the country, the sample, and the window before trusting the percentage.