1&1 Internet SE in numbers
| Primary hostnames detected | 11,772,165 |
| Share of sites with a hosting company | 3.5% |
| Share of all 390.1M primary hostnames | 3.0% |
| Rank in Top Hosting Providers | #4 |
| Measurement | June 2026 crawl |
How is "hosting company" defined? Each website's IP address is announced by an autonomous system (AS) - a network operated by a hosting provider, cloud platform or carrier. We attribute each primary hostname to the company operating that autonomous system. This measures where websites are served from, not where their domains are registered. Reverse proxies such as Cloudflare announce the IP the visitor reaches, masking the origin host behind them.
Frequently asked questions
How many websites are hosted by 1&1 Internet SE?
As of June 2026, 1&1 Internet SE is detected on 11,772,165 primary hostnames - 3.5% of sites with a hosting company and 3.0% of all 390.1M primary hostnames in the Dataprovider.com index. It ranks #4 in the Top Hosting Providers report.
Is historical data for 1&1 Internet SE available?
This page shows the current monthly snapshot. For historical analysis, contact the Dataprovider.com team.
Where can I get more detailed data and historical trends?
Dataprovider offers access to 400M+ domains analyzed monthly, 200+ structured data fields, and four years of historical data. Contact the Dataprovider team at dataprovider.com to get access.
How to cite
Dataprovider.com Research (June 2026). How many websites are hosted by 1&1 Internet SE? https://www.dataprovider.com/research/domains/top-hosting-providers/11-internet-se/