Code or phrase

Lookup results

Common ways to use this reference:

Debug API responses
Look up a status code from logs, browser devtools, or an API client and confirm what it means.
Search by reason phrase
Type part of a phrase such as timeout, unauthorized, or redirect to find matching codes quickly.
Prepare bug reports
Copy exact status-code results into QA tickets, incident notes, or support handoffs.
Check uncommon client and server errors
Verify less-common codes like 418, 429, 451, or 508 without leaving the page.
Teach or document HTTP basics
Use a simple lookup tool while writing documentation or explaining status codes to teammates.

How do I search this reference?: Enter a 3-digit code for a direct lookup, or type part of a reason phrase to find matching HTTP status codes.
Does it include every possible HTTP status code?: It includes a broad set of common standard HTTP status codes used in modern web work. If a code is missing, the tool tells you it is not in this reference.
Does the app store my query or send it to a server?: No. Queries stay in your browser for lookup and copy actions. The tool itself does not upload them.
Why did I get no result?: Exact codes must be 3 digits and present in the built-in reference. Text searches only match known reason phrases in the dataset.
Can I copy multiple matches?: Yes. When a phrase matches several HTTP status codes, the output lists each match on its own line and the Copy button copies the full block.