HTTP Status Code Lookup

What do HTTP status codes mean?

What this tool does

This lookup helps you find an HTTP status code by number or keyword and read a short, plain explanation. Each card shows the code, reason phrase, family (1xx–5xx) and a concise meaning so you can confirm what a response is trying to say.

Why you need it

Status codes are short, but teams still mix them up under pressure. Is a failed login a 401 or a 403? Is a validation problem a 400 or a 422? When logs, gateways and API docs disagree, a fast reference prevents the wrong fix. You should not need to open a full RFC every time a dashboard shows an unfamiliar code.

How to use it

1. Type a code (like 404) or a keyword (like “unauthorized” or “too many”).
2. Optionally narrow the grid with family chips: 1xx, 2xx, 3xx, 4xx or 5xx.
3. Open a card to read the reason phrase and short meaning.
4. Copy the code and phrase when you need it for docs, tickets or client error handling.
5. Clear filters to reset the full list.

Practical examples

• API debugging: Match a gateway response to the intended client behavior.
• Error docs: Keep public API docs consistent with standard phrases.
• Support tickets: Translate “we got a 429” into rate-limiting guidance.
• Frontend handling: Decide whether to retry (408/429/503) or show a hard failure (400/404).

How it works

HTTP responses start with a three-digit status. The first digit defines the class: informational (1xx), success (2xx), redirection (3xx), client error (4xx) or server error (5xx). The remaining digits identify a more specific outcome. Standards bodies and RFCs define many codes; platforms also invent extensions, so not every number you see in the wild is equally “official.”

This page ships a curated set of common codes—including practical ones like 422, 429 and 451, plus the humorous 418—and searches them locally in your browser. Nothing is fetched from a remote API when you type.

Common mistakes

• Treating every 4xx the same: Clients should usually fix 400/422 input errors; 401 needs credentials; 403 may need permissions; 429 needs backoff.
• Retrying non-idempotent failures blindly: A 500 on POST is not always safe to replay without idempotency keys.
• Confusing redirects: 301/308 are permanent; 302/307 are temporary—SEO and caching care about the difference.
• Assuming the body explains the code: Many APIs return opaque JSON; the status is still the primary signal.

FAQ

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