HTTP Status Code Reference

Look up any HTTP status code — what it means and when you actually see it.

What you provide

Result

CHECK

404 Not Found

The server has no resource at that address.

Diagnostic telemetry
Code
404
Name
Not Found
Category
Client error
When you see it
A mistyped URL, a deleted page, or a broken link. The server is fine; the page is not.

What this cannot tell you

  • A reference table, not a live check. It explains what a code means; it does not tell you why a specific site returned one.
  • Status codes are added over time and servers define their own within a class. Verify anything unusual against the current HTTP specification.

Take this with you

HTTP Status Code Reference on RunTheTests — free browser-based netmath tools, no sign-up.