HTTP Status Code Lookup

The HTTP Status Code Lookup is a searchable reference for every standard HTTP status code — search by number, name, or a keyword describing the situation, and get the matching codes with their official meaning explained in plain language.

It's the fast alternative to searching 'what does status 429 mean' every time an unfamiliar code shows up in a browser network tab, an API response, or a server log. Developers use it while debugging why a request failed (was it a 404, or something more specific like 410 Gone?), API designers use it while deciding which status code correctly represents a given error condition, and anyone learning web development uses it to understand the difference between similar-sounding codes like 401 Unauthorized and 403 Forbidden.

The reference covers all five status code classes: 1xx informational (rare, mostly protocol-level), 2xx success, 3xx redirection, 4xx client errors (the largest and most commonly encountered group) and 5xx server errors. Search matches against the code number itself, the official reason phrase ('Not Found', 'Too Many Requests'), and the description text, so searching a rough term like 'rate limit' surfaces 429 Too Many Requests even without knowing the exact phrase or number.

Status codes are grouped by their first digit for a reason worth understanding, not just memorizing: the first digit tells a client broadly how to react (2xx: it worked, 4xx: fix your request, 5xx: try again later or contact the server owner) even before reading the specific code, which is why well-behaved HTTP clients and libraries often branch logic on that first digit alone. Some codes carry real operational weight beyond their literal meaning — a 429 typically signals a retry-after delay is expected, a 503 often means a service is intentionally down for maintenance rather than broken, and a 3xx redirect's exact code (301 permanent vs. 302/307 temporary) affects whether search engines and caches update their stored URL. This is a static reference — no request is made anywhere, and searching happens instantly in your browser.