HTTP status codes are three-digit numbers returned by a server to describe the result of a request. They are grouped into five classes: 1xx informational, 2xx success, 3xx redirection, 4xx client errors, and 5xx server errors. This reference lets you search them quickly.

• Searchable list of common status codes • Search by number, name, or description • Color-coded by response class • Plain-language explanations • Always available offline in your browser

1. Type a code (like 404), a name, or a keyword 2. The matching status codes appear instantly 3. Read the explanation and response class