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Microsoft IIS

Microsoft IIS in each crawled group, and in the wider sample. Hosting and CDN.

GroupCrawledRunning Microsoft IISShare
Inc 5000 (2026) 4,886 18 0.4%
Y Combinator companies 5,386 5 0.1%
Fortune 500 472 23 4.9%
Unicorns 1,000 n/a n/a
SaaS companies 8,173 159 1.9%
Tranco top 10,000 1,572 12 0.8%
Wider sample 8,291 38 0.5%

Group rows come from rendered homepage crawls; the wider sample is a plain fetch, so it undercounts tools a tag manager injects after the page loads. <5 means fewer than 5 crawled domains in that group. Method · Hosting and CDN across all groups · Origin running Microsoft IIS, identified by its server and ASP.NET version headers.

Detected by: header server: Microsoft-IIS header x-aspnet-version

Wider sample

Microsoft IIS was detected on 38 of 8,291 company websites drawn from Crunchbase company records, companies with 11 to 1,000 employees. The cuts below divide by each segment's own crawled base.

By industry

IndustryCrawledRunning Microsoft IISShare
Artificial Intelligence (AI) 1,631 3 0.2%
Financial Services 548 5 0.9%
Biotechnology 521 2 0.4%
Information Technology 503 3 0.6%
Health Care 420 1 0.2%
Apps 395 0 0.0%
Data and Analytics 373 0 0.0%
Commerce and Shopping 347 4 1.2%
Administrative Services 344 1 0.3%
Energy 294 1 0.3%

By employee size band

Size bandCrawledRunning Microsoft IISShare
11-50 6,249 26 0.4%
51-200 2,042 12 0.6%

By country

CountryCrawledRunning Microsoft IISShare
United States 5,475 26 0.5%
United Kingdom 803 3 0.4%
Canada 480 5 1.0%
Germany 430 1 0.2%
France 422 0 0.0%
Australia 212 1 0.5%
Netherlands 146 0 0.0%
Sweden 84 1 1.2%
Denmark 75 0 0.0%
Finland 68 1 1.5%

Cite this

Installmap, Microsoft IIS adoption, crawl of 2026-09-03, https://installmap.com/tools/iis.

Canonical URL
https://installmap.com/tools/iis
Denominator
38 of 8,291 crawled company websites in the wider sample, a share of 0.5%

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