.rio TLD stats

• Run by Empresa Municipal de Informática SA - IPLANRIO

Names on the books at the end of each year since general availability, from the registry's monthly reports to ICANN, through May 2026. The marked point is the zone count of 23 Oct 2026, a different count taken on one night.

In its first year, to August 2016, 5 registrars held 10 or more .rio names and the largest held 72%; by its tenth, to August 2025, 7 did and the largest held 59%.

Year 1 starts at general availability and each year is labelled by the month it ends. Registrars with 10 or more names and the largest registrar's share are read at that month. A year with fewer than nine monthly reports is left blank.

Key-Systems GmbH held 58.2% of .rio names in May 2026; the largest five together held 83.8%.

Shares add to 100%. From the registry's report for May 2026.

Cross-checkThe registry reported 688 names for Jun 2026; the zone on Oct 23, 2026 held 32 fewer. The two are counted differently and 4 months apart: a registered name that is not delegated never appears in the zone, and a zone file is read on one night, a report at a month's end.

Counted from the registry’s own zone file on the night of Oct 23, 2026. A zone count is not domains under management: a registered name that is not delegated never appears in the zone, and a name on hold leaves the zone while it stays registered. The two numbers will not agree, and neither is wrong.

Names under management at month end, as the registry reported it. Reported to ICANN monthly. Dashed months are third-party estimates. Sunrise Dec 2014 to Jan 2015; general registration Sep 2015.