HTTP Status Code Lookup

Look up any HTTP status code — 200, 301, 404, 503 and every other registered code — and see what it means, what usually causes it and how search engines treat it. Search by number or keyword and filter by class.

This tool runs entirely in your browser.

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How to use the HTTP Status Code Lookup

1Type a code or a word such as “redirect” or “timeout”.
2Filter by class: 1xx informational, 2xx success, 3xx redirection, 4xx client errors, 5xx server errors.
3Read the meaning and, where relevant, how search engines treat it.

What is the HTTP Status Code Lookup?

The first digit says what happened: 2xx success, 3xx “look elsewhere”, 4xx the request was wrong (or not allowed) and 5xx the server failed. The definitions come from the IANA registry, mostly RFC 9110, which replaced the older HTTP/1.1 RFCs in 2022.

For SEO the important pairs are 301/308 (permanent — ranking signals move to the new URL) vs 302/307 (temporary), 404 vs 410 (both remove a page; 410 slightly faster), and 503 with Retry-After for maintenance, which tells crawlers to come back instead of dropping pages.

Frequently asked questions

What is the difference between 401 and 403?

401 means “we don’t know who you are — log in”. 403 means “we know who you are, but you’re not allowed”.

Should I use 301 or 308?

Both are permanent. 308 guarantees the method (e.g. POST) is kept; for normal page moves 301 is the most widely understood.

Is the HTTP Status Code Lookup free and private?

Yes. The HTTP Status Code Lookup is free, needs no account, and runs entirely in your browser. What you type is never sent to a server or stored.

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