How accurate is this detection?

It relies entirely on public headers. If a server is properly hardened or hidden behind a proxy (like Cloudflare), it will mask the true origin stack.

Why hide server headers?

Exposing exact software versions (e.g., Apache 2.4.49) gives attackers a massive advantage, as they can quickly search for known vulnerabilities (CVEs) specific to that version.

What is X-Powered-By?

It is a non-standard HTTP header often injected by backend frameworks (e.g., PHP, Express, ASP.NET) to broadcast the technology driving the application.

Check Website OS & Stack

Analyze server headers to guess the Operating System or Server Stack of a website.

What is the OS & Stack Check?

The OS & Stack Check tool analyzes the HTTP response headers of a website to fingerprint the underlying web server software, operating system, and backend technology stack.

How to use it

Input the target website URL.
Click "Analyze Server".
The tool will examine headers like "Server" and "X-Powered-By" to guess the stack.

Check Website OS & Stack

Analysis Result

What is the OS & Stack Check?

How to use it

Frequently Asked Questions