The most-blocked domains in the world

For every domain that appears in the Voidly evidence table over the last 90 days, we compute:

• n_countries_blocking — the number of distinct ISO-3166 alpha-2 country codes that have at least one blocked observation.
• n_blocked_obs — the count of evidence rows with signal type in dns-blocking, http-blocking-tcp-reset, http-blocking-timeout, block, interference, or http-blocking-blockpage.
• avg_confidence — the mean of the per-row confidence field across all blocked observations for the domain.
• recency_weighted_blocks — the sum of exp(-age_days / 30) over each blocked observation, so recent activity contributes more than archived rows.

The headline importance score is:

importance = n_countries_blocking
           * log(1 + n_blocked_obs)
           * avg_confidence

Filters: a domain must appear in at least 3 distinct countries and have at least 10 total observations (blocked or not) in the window. This drops one-off probes that would otherwise dominate the tail with noise.

Honest caveats. Per-row confidence values are produced by the upstream source (OONI annotates dns- blocking flags with ~0.7–0.9 confidence; CensoredPlanet Satellite flags have ~0.85–0.95). The category column is best-effort: most rows use Citizen Lab’s test list taxonomy where available and a curated map for well-known global-reach domains; everything else is marked OTHER. The window is rolling 90 days, so a domain that was heavily blocked 100 days ago can drop out of the ranking.