HTTP STATUS REFERENCE
Look up a status code and its next check.
Look up common HTTP response status codes, understand the class, and find a practical check for redirects, missing pages, and server errors.
Enter a three-digit code or search by status name.
How to check a real response
This page looks up a curated code list; it does not request or scan a URL. To investigate a response, inspect the actual request and response in your browser’s Network panel, including its method, redirect chain, headers, and timing. A command-line client such as curl -I https://example.com/ sends a HEAD request, which can behave differently from GET; check the method your user or application actually uses.
HTTP status codes are grouped into informational (1xx), successful (2xx), redirection (3xx), client error (4xx), and server error (5xx) classes. Server software may also return unlisted extension or custom codes. Page content updated November 3, 2026.
Good to know
Does this test my website?
No. It does not send requests or scan websites. Use the browser Network panel or an HTTP client to inspect a specific response.
Why might a URL show a different status in another check?
Status can depend on request method, headers, authentication, cache state, redirect handling, and server configuration. Compare the actual requests when debugging.
Does this list every HTTP status code?
No. It covers a curated set of commonly encountered codes. Use MDN or the IANA registry for the full status code reference.
Is it free?
Yes, during beta. Optional usage-credit plans are coming soon. Payments are not available and no credits are required.
Sources
Meanings and code classes are summarized from MDN’s HTTP response status reference. Checked November 3, 2026.
How it works
1. Enter a common HTTP status code or search by name. 2. Read its class and meaning. 3. Follow the suggested manual check; this page does not scan websites.
Good to know
Can this check a URL for me?
No. It is a reference lookup only and does not send requests to a website. Use your browser's Network panel or a command-line HTTP client to inspect a response.
Why can a site return different codes for the same URL?
Responses can depend on request method, authentication, headers, cache state, and server configuration. Check the actual request and response when debugging.
What is the difference between 301 and 302?
301 indicates that the resource moved permanently; 302 indicates a temporary move. For method-preserving redirects, consult 307 and 308.
Are all possible status codes listed?
No. This lookup covers a curated set of commonly encountered codes. MDN links to its broader reference and the IANA registry.
Is it free?
Yes, during beta. Optional usage-credit plans are coming soon. Payments are not available and no credits are required.