Reachability

How to tell an outage from a 404

Someone says the site is down because a page will not load. Confirm the code with Is This Website Down.

Ben Fidge · · 5 min read

HTTP classes: 2xx and 3xx are up, 4xx means the host answered, and 5xx is server-side.
2xx and 3xx are up, a 4xx means the host answered, and 5xx is server-side.

What to run

Use Is This Website Down and HTTP Status Codes. The down check is from Cloudflare. HTTP Status Codes stays in the browser.

How to read the result

404 and 410 mean that URL is missing, not that the server is dead.

500, 502, 503, and 504 are server-side.

401 and 403 mean the server refused this request.

What to open next

Confirm the code on Is This Website Down, then read the class on HTTP Status Codes.

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