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Which TLD leads on DMARC enforcement?
October 2026 census edition
As of October 12, 2026, among TLDs (Top-Level Domains) with at least one million graded domains, .ch leads on DMARC (Domain-based Message Authentication, Reporting and Conformance) enforcement: 31.9% of its domains publish p=quarantine or p=reject, in the Defaults.Exposed census. Split by kind, as the TLD section requires, the average is 14.0% across country-code TLDs and 11.1% across generic TLDs.
Restricted to TLDs with at least 1,000,000 graded domains.
Best TLD for DMARC: how it is measured
It comes from the per-check pass, which runs every graded domain through the full check battery and records a pass, a fail or an undetermined result for each check independently. Every domain in the census is measured directly and counted once.
Enforcement rather than publication is measured here, so a TLD cannot lead on this by having many domains with a p=none record. It requires a population that has taken DMARC through to a policy that acts, which is why the leaders tend to be restricted or institutional TLDs.
The figure is a name rather than a number: whichever entry holds the largest share of the population being measured, with that share stated beside it.
It moves when registry policy changes and when the population under a TLD turns over. A registry that mandates or subsidises a control can shift its whole TLD inside one edition. The number is recomputed from the raw evidence at every edition. What it cannot tell you is where one particular domain stands: for that, see the per-TLD data.
the full grading methodology · the underlying dataset, published open with the counts behind every percentage. If a figure here disagrees with one elsewhere on the site, the dataset is canonical and we would like to know.
Best TLD for DMARC: how to cite it
Please cite Defaults.Exposed and link this page. The citation below carries the date.
Defaults.Exposed, "Which TLD leads on DMARC enforcement?" (as of October 12, 2026). https://defaults.exposed/stats/which-tld-leads-on-dmarc-enforcement
Permalink: https://defaults.exposed/stats/which-tld-leads-on-dmarc-enforcement · Machine-readable: /stats/s/best-dmarc-tld.json · Licence: open data
Methodology: how we grade the internet · Source data: census data and downloads. Updated with each census edition.