Look up a status, pick the right one for an API, or hit a live endpoint that actually returns it. Add ?code=418 to this URL and the response is that status — useful for curl, interceptors, and “what does my client do on 503?” Nothing here phones home except the Try it fetch to this same page.
Which class?
Cloudflare could not resolve the origin hostname, so it never connected. The HTML body usually includes a 1xxx error (often 1016).
When to use
Check the origin DNS Cloudflare is using — missing A/AAAA/CNAME, a CNAME loop, or a hostname that does not exist.
Don’t
Do not emit 530 yourself. A known origin IP that will not route is 523; connection refused is 521.
Live URL
curl -i https://corecoding.com/utilities/http-status.php?code=530
No codes match.
Code use cases