IIS Market Share Report, Jan 2021

Number of websites that use IIS

How many websites uses IIS? Of all the 87,162,124 sites that use Web Server, IIS is used by 29,624,425 sites, or 33.99% of all websites. Of all the different Web Server platforms, IIS's rank is #2 out of 17.

IIS Market Share

About IIS

Internet Information Services (IIS) for Windows Server is a flexible, secure and manageable Web server used for hosting anything on the internet.

How did we calculate IIS's market share data?

PerfectLeads calculates the market share as the number of websites using IIS divided by the number of total companies in the Web Server category. We then round the market share values to the nearest hundredth.

Websites that use IIS

Sites in the top 10k on Alexa that use IIS

Sites in the top 100k on Alexa that use IIS

Sites in the top 1M on Alexa that use IIS