About This Tool
HTTP status codes are the language servers use to communicate the outcome of every web request. Whether a page loaded successfully, a resource moved permanently, authentication failed, or the server crashed, there is a standardized three-digit code for it. This reference covers the complete set of codes defined across RFC 7231, RFC 6585, and common extensions, organized into the five official categories.
The reference is fully searchable in real time — type a code number, a keyword from the name, or any word from the description and the list filters instantly. This makes it fast to look up an unfamiliar code spotted in a log file, find all codes related to authentication, or scan through the 4xx family when debugging client errors. Each entry shows the numeric code, the official name, and a plain-English explanation of when it is used.
Codes are grouped by category for easy browsing: 1xx Informational (provisional responses), 2xx Success (request received and processed), 3xx Redirection (further action needed), 4xx Client Errors (the request has a problem), and 5xx Server Errors (the server failed to fulfil a valid request). Whether you are a developer, sysadmin, or SEO professional, this reference belongs in your daily toolkit.