HTTP Status Lookup
Search HTTP response codes online by number or phrase for faster API debugging.
About This Tool
This free online HTTP status lookup helps you interpret API and web response codes in seconds. Enter a numeric code like 404 or 503 to see its standard meaning and response class. You can also search by phrase, such as "timeout" or "unauthorized", to quickly discover matching status codes during debugging sessions.
The tool is useful for backend development, monitoring setup, QA validation, and incident triage. Everything runs in-browser with no login and no input data saved on IO Tools servers.