Web Server Checker: What Server Software Does This Website Use?

Enter a site address to see the web server software it announces, such as Nginx, Apache or IIS. Free, instant, no signup.

FreeNo signupNo account or emailLast checked November 2026

A free web server checker. Enter a URL and it reads the Server, X-Powered-By and related response headers to show which web server software the site announces, such as Nginx, Apache, Microsoft IIS or LiteSpeed. No signup, no email.

What it checks

  • The Server header
  • X-Powered-By, X-AspNet-Version, X-Generator and similar headers
  • The Via header, which names proxies

What you get

  • The server software as announced
  • Every header that names software, with its value

Limits

  • The values are what the server chooses to say; they can be hidden or changed
  • Sites behind a CDN often show the CDN instead of the origin server
  • One request to the page you enter
What the Server header tells you

The Server header is set by the web server software, for example nginx, Apache, Microsoft-IIS or LiteSpeed. X-Powered-By often names the language or framework behind it, such as PHP or Express.

These headers are information the server volunteers, so they can be wrong on purpose. For software that shows up in the page itself, use the Technology Detector.

Frequently asked questions

How can I tell what web server a website is running?

Enter its address above. The tool reads the Server response header and related headers such as X-Powered-By. In a browser, the same header is in the developer tools under Network.

Why does it show Cloudflare instead of Nginx or Apache?

When a site sits behind a CDN, the response comes from the CDN and carries its name. The server behind it is hidden, which is normal.

Is it a problem if my server shows its version number?

It is better not to. A version number tells attackers which known flaws to try. Most servers can send just the name, or nothing, through a one-line setting.

Related tools

HTTP Header CheckerDNS LookupSSL Certificate CheckerDomain Age Checker

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