How to Tell if a Website Uses Microsoft IIS
Identifying whether a website was built with Microsoft IIS used to require technical expertise — inspecting source code, tracing network requests in DevTools, and knowing which patterns to look for. Our free scanner automates all of that: it fetches the page, analyzes 1 Microsoft IIS-specific signals, and returns a verdict with a confidence score.
You might want to detect Microsoft IIS for competitive research, due diligence before acquiring a site, or simple curiosity. Whatever the reason, this page covers every method — automated and manual.
What is Microsoft IIS?
Microsoft IIS is a Hosting used to build websites and web applications.
It is primarily used for business websites, portfolios, landing pages, and personal sites without coding knowledge.
Visit Microsoft IIS official websiteSigns a Website Is Built With Microsoft IIS
Our detection engine checks 1 unique Microsoft IIS fingerprints. Here are the most reliable signals:
HTTP Response Headers
Microsoft IIS-hosted sites respond with specific HTTP headers that identify the platform or infrastructure. These are visible in DevTools → Network tab.
serverHow to Manually Detect Microsoft IIS Websites
Method 1 — View Page Source
- Open the website in your browser
- Press
Ctrl+U(Windows) orCmd+Option+U(Mac) - Search (
Ctrl+F) formicrosoft-iisormicrosoftiis - If found in script src, class names, or meta tags — it's likely Microsoft IIS
Method 2 — Browser DevTools Network Tab
- Press
F12to open DevTools - Click the Network tab and reload the page
- Filter by
microsoftin the search box - If you see requests to Microsoft IIS-specific domains, it's confirmed
How Our Microsoft IIS Detector Works
When you submit a URL, our engine fetches the page from its server — just like a browser would — then analyzes the response across 1 Microsoft IIS-specific fingerprints:
Script analysis
We scan all loaded JavaScript files for known CDN paths and runtime names
CDN domain matching
We cross-reference every asset request against known platform CDNs
HTML pattern scanning
We search the DOM for platform-specific class names and data attributes
Header inspection
We read HTTP response headers that identify the server or platform
Meta tag extraction
We check generator and other meta tags in the document head
Confidence scoring
We weight each matched signal and normalize to a 0–99% score
How to Build a Similar Website With Microsoft IIS
Sign up at https://www.iis.net, pick a template, customize it with the drag-and-drop editor, add your content, and publish. Most website builders offer free plans to get started.
Other popular website builders include Wix, Squarespace, Webflow, Carrd, and Showit.
Get started with Microsoft IISFrequently Asked Questions
How can I tell if a website was built with Microsoft IIS?
The most reliable ways to detect Microsoft IIS are: (1) open DevTools → Network tab and look for requests to Microsoft IIS-specific CDN domains, (2) view page source and search for Microsoft IIS-specific class names or data attributes, (3) use our free scanner — we check 1 detection signals automatically and return a confidence score.
Is your Microsoft IIS detector free?
Yes, completely free. Paste any URL into our scanner and we'll analyze it for Microsoft IIS fingerprints immediately. No account required, no limits on scans.
How accurate is the Microsoft IIS detection?
We check 1 unique Microsoft IIS fingerprint signals across HTML, JavaScript, CDN domains, meta tags, and HTTP headers. Our confidence score reflects how many signals matched — a score above 70% is a strong indicator. We cap accuracy at 99% to reflect that all fingerprint-based detection is probabilistic.
Can Microsoft IIS sites be detected if they use a custom domain?
Yes. Custom domains don't hide the underlying platform. The JavaScript files, CDN requests, HTML attributes, and server headers all remain identifiable regardless of the domain name used. Our scanner fetches the page directly and analyzes its technical composition.
What should I do after detecting a Microsoft IIS website?
If you want to build something similar, visit https://www.iis.net to learn more or sign up. If you're doing competitive research, our scan result also shows the full technology stack — including hosting platform, domain age, and other detected technologies. You can share the result link with your team.