HTTP Status Code Lookup

Summary

Enter a 3-digit HTTP status code or search by name to get its meaning, category, RFC reference, and common causes.

How it works

1. Type a 3-digit HTTP status code (e.g. 404) in the input field.
2. Or search by name — type "not found" to filter matching codes.
3. Use the category filter to browse only 4xx client errors, 5xx server errors, etc.
4. Click Lookup to see the full details: name, category, description, RFC reference, and common causes.
5. Click any row in the code table on the right to look it up instantly.

Use cases

• Quickly understand what an unfamiliar HTTP response code means.
• Look up the correct status code to return from an API endpoint.
• Identify which RFC governs a specific HTTP response code.
• Learn common causes of server or client errors during debugging.

Frequently Asked Questions