ASP.NET is Microsoft's web application framework, spanning the older .NET Framework-based Web Forms/MVC stack and the modern cross-platform ASP.NET Core, widely used in enterprise, government, and Windows-centric organizations. AIWebsiteDetector identifies ASP.NET deployments through the `X-Powered-By`/`X-AspNet-Version`/`X-AspNetMvc-Version` response headers Microsoft's runtime adds by default, and — for older Web Forms applications — the `__VIEWSTATE` hidden field that ASP.NET's page lifecycle injects into every form.
Detect ASP.NET Websites — Free Tool
Enter any URL to check if it was built with ASP.NET. Instant results, no account required.
How we detect ASP.NET — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How to Detect ASP.NET Websites
HTML Patterns
1 patterns
HTTP Headers
3 patterns
1. Check the Page Source
Open the website in your browser, right-click, and select "View Page Source". Search for asp.net-specific patterns in the HTML.
4. Use AI Website Detector (Easiest)
Our automated scanner checks all these signals at once and gives you an instant confidence score. Just enter any URL above.
Frequently Asked Questions
Is this website built with ASP.NET?
You can detect if any website was built with ASP.NET by using our free scanner above. Just enter the URL and we'll analyze HTML patterns, JavaScript files, CDN domains, and HTTP headers to determine if ASP.NET was used — with a confidence score.
How to detect if a website was built with ASP.NET?
There are several ways to detect ASP.NET: (1) View the page source and look for ASP.NET-specific class names or script URLs, (2) Check the Network tab in DevTools for requests to ASP.NET CDN domains, (3) Use our free tool — we check 4 detection signals automatically.
What websites are built with ASP.NET?
ASP.NET is used by thousands of websites worldwide. Our scanner has detected many ASP.NET-built sites across different industries. You can scan any URL to check if it uses ASP.NET.
How accurate is the ASP.NET detection?
Our ASP.NET detection engine checks 4 unique fingerprint signals, achieving high confidence results. We score each match and return a confidence percentage so you know how certain the detection is.
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Detection Info
- Category
- Backend Framework
- Signals Used
- 4 patterns
- Accuracy
- High
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