Find an HTTP Status Code
Search by a number such as 404, a phrase such as Too Many Requests, or a class such as client error. Use the class selector to narrow results to 1xx, 2xx, 3xx, 4xx or 5xx. This bundled reference lists permanent assigned codes from the IANA registry with short explanations; unused, temporary and obsolete entries are not presented as current standard choices.
Understand Response Classes
Informational responses continue an exchange. Success codes indicate that a request was handled according to the particular code. Redirect responses require another step or refer to a cached representation. Client-error responses describe a request the server cannot fulfill, while server-error responses describe a failure on the server side. The individual code matters more than the class alone.
Use Status Codes in Context
A status code is one part of a response. Inspect headers such as Location, Retry-After and WWW-Authenticate alongside the body and request method. The lookup does not contact a server or diagnose why a particular service returned an error. Consult the linked registry and specifications when implementing protocol behavior.
Standards and references
Frequently asked questions
Does this tool check my website?
No. It searches a local reference and sends no diagnostic request.
Are vendor-specific status codes included?
No. The list avoids vendor-specific inventions and excludes unused, temporary and obsolete registry entries.
How can I find all redirect codes?
Choose 3xx Redirection in the class filter, or search for redirection.
Why is a code missing?
It may be unassigned, temporary, obsolete or vendor-specific. Check the IANA registry for its current registration.