HTTP Status Code Lookup

Search the full set of standard HTTP response status codes by number or by name and read a plain language explanation of what each one means and which category it belongs to. Type 404 to jump straight to Not Found, or type a word like timeout or redirect to see every related code. The codes are grouped the way the specification defines them: informational, successful, redirection, client error and server error, so you can quickly tell whether a response indicates a problem on the caller side or the server side. This is a fast reference when you hit an unfamiliar code while debugging an API, reading server logs or checking a curl response. Every code and description is built into the page, so it works completely offline and instantly, with no lookups and nothing sent anywhere.