HTTP Status Code Lookup
Look up any HTTP status code and get its official meaning instantly, from 100 Continue to 511 Network Authentication Required.
Free, no signup. Covers every standard 1xx-5xx status code.
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How to Look Up an HTTP Status Code
Get the official meaning of any status code in three steps.
Enter a Code
Type any HTTP status code, e.g. 404, 500, or 301.
Look It Up
Click Look Up (or pick a common code) to fetch its official meaning.
Copy or Download
Copy the result to your clipboard or download it as a .txt file.
input
404
result
404: Not Found
Full Coverage
Every standard 1xx-5xx HTTP status code, including uncommon ones.
Instant Lookup
Type a code or pick a common shortcut for an instant answer.
Copy or Download
Copy the result to your clipboard or download it as a .txt file.
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Frequently Asked Questions
What does the HTTP Status Code Lookup tool do?
Enter any HTTP status code from 100-599 and instantly see its official meaning, such as 404 Not Found or 500 Internal Server Error.
Which status codes are supported?
All standard IANA-registered HTTP status codes across the 1xx, 2xx, 3xx, 4xx, and 5xx classes, including less common ones like 418 I'm a Teapot and 429 Too Many Requests.
What if I enter an unregistered code?
The tool tells you it's an unknown status code rather than guessing, so you never get a misleading answer.
Is this useful for debugging APIs?
Yes. It's a fast reference while reading server logs, browser network tabs, or API documentation without needing to search the web.
What does a 404 status code mean?
404 Not Found means the server understood the request but has no resource at that URL. It's a client-side (4xx) error, so the usual causes are a typo in the path, a deleted page, or a broken link, not a server outage.
What does a 500 internal server error mean?
500 Internal Server Error means the server hit an unhandled condition and could not complete the request. It's a server-side (5xx) error, so the fix is in your application logs, not in the browser. Look for an uncaught exception at the matching timestamp.
What is the difference between 401 and 403?
401 Unauthorized means you have not authenticated, so either no credentials were sent or they were invalid, so logging in may fix it. 403 Forbidden means you are authenticated but not permitted to access this resource, and retrying with the same account will not help.
What is the difference between a 301 and a 302 redirect?
301 Moved Permanently tells clients and search engines the URL has changed for good, so they should update their links and pass ranking signals to the new address. 302 Found signals a temporary move, so the original URL stays indexed. For SEO migrations you almost always want 301.
What does 502 Bad Gateway mean and how is it different from 504?
502 Bad Gateway means a proxy or load balancer got an invalid response from the upstream server. 504 Gateway Timeout means the upstream server never responded in time. Both point at the backend behind your proxy rather than at the proxy itself.
What does 429 Too Many Requests mean?
429 means you have hit a rate limit. The response usually carries a Retry-After header telling you how long to wait. The fix is to back off, batch your calls, or request a higher quota from the API provider.
Which status code should my API return for a validation error?
400 Bad Request for malformed syntax the server cannot parse, and 422 Unprocessable Entity when the syntax is valid but the values fail your business rules. Both are 4xx, which correctly tells the client that retrying without changes will fail again.
What do the 1xx, 2xx, 3xx, 4xx, and 5xx classes mean?
1xx is informational, 2xx is success, 3xx is redirection, 4xx is a client error (the request was wrong), and 5xx is a server error (the request was fine but the server failed). Reading the first digit tells you which side to start debugging on.
Is this free to use?
Yes. The HTTP Status Code Lookup tool is completely free with no signup, no login, and no limits.
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