HTTP Status Code Reference
Quick Answer
401 Unauthorised means the client is not authenticated. 403 Forbidden means the client is authenticated but does not have permission to access the resource.
What Is HTTP Status Code Reference?
HTTP Status Code Reference is a free online network tools tool that browse all http status codes from 1xx informational to 5xx server errors. An HTTP status code reference lists every standard HTTP response code defined by the Internet Assigned Numbers Authority (IANA), grouped by class: 1xx (informational), 2xx (success), 3xx (redirection), 4xx (client error), and 5xx (server error). Each entry shows the code number, its standard name, and a brief explanation of when it is used. This is a quick lookup tool for developers debugging API responses, configuring server rules, or studying for web development interviews. You can browse by category or search by code number or keyword. The reference is pulled from the official HTTP specification and is updated to cover codes like 425 (Too Early) and 426 (Upgrade Required). All data is static and client-side. Unlike many similar tools, it runs entirely in your browser — no data is sent to any server, no account is required, and there are no usage limits. Whether you are a developer, writer, SEO professional, or casual user, this tool provides instant, accurate results without friction.
How to Use HTTP Status Code Reference
Browse codes by status class or search by number (e.g. 404) or keyword (e.g. 'redirect'). Click any code to see its full description and typical use case.
Key Features
- Complete IANA HTTP status code list
- Search by code or keyword
- Grouped by status class (1xx–5xx)
- Fully client-side
Common Use Cases
- Quick reference during API development or debugging
- Studying for web development interviews
- Configuring custom error pages or redirect rules
Common Mistakes to Avoid
- Confusing 401 (Unauthenticated) with 403 (Forbidden)
- Using 302 when 303 or 307 is more appropriate for modern APIs
- Returning 500 for client errors instead of an appropriate 4xx code
Related Topics & Entities
- HTTP
- Status code
- IANA
- API
- Server error
Common Questions About HTTP Status Code Reference
Related Tools & Resources
- SSL Checker
- IP Lookup
- Port Reference
Best Practices for HTTP Status Code Reference
To get the most out of HTTP Status Code Reference, follow these best practices. Ensure your input data is clean and properly formatted for the most accurate results. Use the copy function to transfer output directly to your clipboard. Bookmark the tool for easy access. Check the related tools section below for complementary utilities that can enhance your workflow. Remember that all processing is client-side, so your data never leaves your browser.
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Privacy & Security
HTTP Status Code Reference processes all data entirely within your browser using JavaScript. No text, files, or personal information is transmitted to any server. Your data stays on your device, making this tool safe for sensitive content. We do not track usage, store inputs, or share data with third parties. The tool works offline after the initial page load and requires no account to use.
Frequently Asked Questions
Find answers to common questions about this tool.