💻 HTTP Status Lookup — Code Meanings
Enter a status code such as 404 or 429. The lookup explains the class and a practical meaning for APIs and web pages.
How it works
- Enter a three-digit HTTP status code.
- Press Look up. Known codes return a name, class and a short usage note.
- Unknown codes still show the class from the first digit, such as 4xx client error.
Examples
- 404 is Not Found, a client error when the target resource does not exist.
- 301 is Moved Permanently, a redirect that clients and caches may store.
- 503 is Service Unavailable, a server error often used during maintenance.
Frequently asked questions
Are unofficial codes included?
The list covers widely used codes from the HTTP specifications and common extensions such as 418 and 429. Obscure vendor codes may only get a class label.
Does this call a website?
No. The meanings are bundled in the page and the lookup runs locally.
What is the difference between 401 and 403?
401 means authentication is missing or rejected. 403 means the server understood the request but refuses to authorize it.
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