Spam Activity: Key Statistics Quarter over Quarter comparison: March 1,2026 - May 31,2026
Each reporting period, we analyze domain names reported for spam. We collect spam reports from three reputation blocklists (Spamhaus, SURBL, Invaluement). We eliminate duplicates and enhance these reports with other metadata — domain and IP address registration data, ICANN registry and registrar monthly reports, routing data, attack type, and other indicators — to create spam records. We use the spam records to measure and report key statistics for each reporting period.
A comparison of key statistics for the periods December 1, 2025 - February 28, 2026 and March 1,2026 - May 31,2026 appears in the table below.
| Measurement | December to February 2026 | March to May 2026 | ChangeinMeasurement |
|---|---|---|---|
| Total number of spam reports collected from feeds (per quarter) | 4,260,387 | 4,393,220 | 132,833 |
| Total number of spam records produced from spam reports | 3,558,735 | 3,810,132 | 251,397 |
| Unique domain names reported for hosting spammed content or spambots | 3,322,601 | 3,563,241 | 240,640 |
| Top-level Domains (TLDs) with domain names reported for hosting spammed content or spambots | 775 | 771 | -4 |
| Registrars (by distinct IANA ID) that had gTLD domains under management reported for hosting spammed content or spambots | 2,703 | 2,514 | -189 |
| Registrars (by distinct name) that had domains under management reported for hosting spammed content or spambots | 3,711 | 3,693 | -18 |
| Hosting Networks (ASNs) where we observed hosted spammed content or spambots | 4,025 | 4,264 | 239 |
| Number of subdomain reseller accounts reported for hosting spammed content | 121,138 | 114,629 | -6,509 |
| Quarterly Update: Key Statistics |
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| Quarter over Quarter: Key Statistics |
Quarter over Quarter: Top Level Domains |
Quarter over Quarter: Registrars |
Quarter over Quarter: Hosting Networks |