Free HTTP Status Code Lookup

Complete HTTP Status Code Reference

This tool provides a searchable reference of standard HTTP status codes — the three-digit numbers servers return to indicate the result of a request. Search by code number or by keyword to instantly find an explanation.

The Five Status Code Categories

• 1xx (Informational) — the request was received and processing continues.
• 2xx (Success) — the request was successfully received, understood, and accepted.
• 3xx (Redirection) — further action is needed to complete the request, typically following a different URL.
• 4xx (Client Error) — the request contains bad syntax or cannot be fulfilled due to something on the client's side.
• 5xx (Server Error) — the server failed to fulfill an apparently valid request due to a server-side problem.

Why Status Codes Matter

HTTP status codes are how servers communicate the outcome of every request to clients — browsers, APIs, and applications all rely on these codes to know whether a request succeeded, needs a redirect, was invalid, or hit a server problem. Understanding what each code means is essential for debugging web applications, building and consuming APIs, and diagnosing issues reported by monitoring tools or error logs.

Common Uses for This Reference

• API development — choosing the correct status code to return for different response scenarios.
• Debugging — quickly understanding what an unfamiliar status code in a log or network tab means.
• Learning web development — building familiarity with the standard HTTP status code vocabulary.

Privacy and Local Processing

This tool uses a built-in reference list stored directly in the page — no external API calls or server requests are needed to search or filter results.