HTTP Status Code Lookup
Look up any HTTP status code from 100 to 511 with plain-language explanations, searchable and filterable by category.
HTTP Status Code Lookup — HTTP status codes are the three-digit responses a server sends with every request. They are the first thing to check when an API returns something unexpected: a 404 means the resource is missing, a 429 means you are being rate-limited, a 503 means the server is down.
This reference is fully static — no code, text, or data is sent anywhere.
What is http status code lookup?
HTTP status codes are the three-digit responses a server sends with every request. They are the first thing to check when an API returns something unexpected: a 404 means the resource is missing, a 429 means you are being rate-limited, a 503 means the server is down.
This reference covers the common codes from every class — informational, success, redirection, client error, and server error — each with a short plain-language explanation. Search by number or name, or filter by category to find what you need fast.
How to use it
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Search by number or name
Type "404", "redirect", or "teapot" to find matching codes instantly.
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Filter by category
Jump straight to 2xx success codes or 4xx client errors with one click.
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Click a category chip to clear it
Tap the active filter again to show all codes.
Examples
The codes you will meet most often
A quick reference for the most common responses.
Search "not found"
Result: 404 Not Found — the server cannot find the requested resource.