Understanding HTTP status codes
HTTP status codes are grouped by their first digit: 2xx for success, 3xx for redirects, 4xx for client errors, and 5xx for server errors. Knowing them speeds up debugging APIs and web requests.
HTTP Status Code Lookup
Type a status code to see its meaning, or browse the full reference table below.
| Status code | Reason phrase |
|---|---|
| 200 | OK |
| 201 | Created |
| 204 | No Content |
| 301 | Moved Permanently |
| 302 | Found |
| 304 | Not Modified |
| 400 | Bad Request |
| 401 | Unauthorized |
| 403 | Forbidden |
| 404 | Not Found |
| 405 | Method Not Allowed |
| 408 | Request Timeout |
| 409 | Conflict |
| 422 | Unprocessable Entity |
| 429 | Too Many Requests |
| 500 | Internal Server Error |
| 502 | Bad Gateway |
| 503 | Service Unavailable |
| 504 | Gateway Timeout |
How it works
- 1
Type a code, extension, or keyword.
- 2
Browse the matching reference entries.
- 3
Copy the detail you need.
Why use this tool
- Runs entirely in your browser — nothing is uploaded to a server.
- 100% free, no sign-up, no limits.
- Works in any modern browser — no app install, no extension, no account.
How to use HTTP Status Code Lookup
Search in HTTP Status Code Lookup to look up reference values. Results come from the built-in dataset on this page.
Tips for better results
Try partial matches if the exact code is unknown.
Privacy and offline-friendly processing
Whenever possible, HTTP Status Code Lookup processes your data locally with JavaScript in this page. That means drafts, secrets, and unfinished work stay on your device by default. Prefer this workflow when you do not want to upload sensitive text, tokens, passwords, or files to a third-party service.
Frequently asked questions
What is the difference between 401 and 403?
401 Unauthorized means authentication is required or failed; 403 Forbidden means the server understood the request but refuses to authorize it.
What does 429 mean?
429 Too Many Requests indicates the client has sent too many requests in a given time frame, commonly seen with rate limiting.
Is my data uploaded when I use this tool?
For most FlyUtils tools, no. Processing happens in your browser with JavaScript. If a tool ever needs a server, that will be stated clearly on the page.
Is HTTP Status Code Lookup free to use?
Yes. HTTP Status Code Lookup is free, with no sign-up and no artificial usage caps for normal personal and work use.
Does HTTP Status Code Lookup work on mobile?
Yes. The page is mobile-first, so you can paste input, tweak options, and copy results from a phone or tablet.