Self‑hosted email usage drops sharply in Tranco top 1M domains

Artem Berezin, a researcher at the RIPE Labs, released a new analysis of the Tranco top‑1 million domain list that highlights two dominant email‑service providers, a persistent plateau in domain‑age distribution, and an unusually long tail of email addresses. By parsing the Tranco dataset, Berezin identified that a pair of providers account for a disproportionately large share of the most frequently accessed domains, suggesting a concentration of web traffic that could influence both search engine ranking and cybersecurity risk assessment.

The study also uncovered a “stubborn plateau” in the age distribution of domains, indicating that a significant portion of the top‑ranked sites have been active for a similar length of time, which may reflect a stabilization of the online ecosystem or a bottleneck in domain renewal practices. In addition, Berezin’s work revealed a very long tail of email addresses associated with these domains, pointing to a wide variety of user‑generated or low‑profile accounts that persist alongside the major providers. These findings provide a nuanced view of how domain ownership and email usage are distributed across the internet’s most visited sites.

Overall, the analysis underscores the concentration of web traffic around a few key providers while also highlighting the diversity of email usage at the margins of the top domain list. The insights could inform future studies on internet infrastructure resilience, the impact of domain concentration on search engine optimization, and the design of more effective email‑security policies.