Where it actually runs
The public IP the domain resolves to, where it sits, and the network (ASN) that operates it. Behind a CDN, these describe the edge, not the origin. Free, no signup, 5 checks a day.
5 free checks a day. No signup, no key.
Where the site answers from
The public address
The IP the domain resolves to from the checker's vantage point — the same answer any public resolver gets. It is one address, not the whole truth about where a site lives.
CDN edge vs origin
Behind a CDN, the IP, location and provider describe the edge node, not the origin server. The sheet says so instead of presenting a Cloudflare node as the host.
ASN — who to call
The autonomous system number names the network that operates the address. It answers the 'who do we even call' question when a site is down and the owner has long moved on.
Location
Country and city come from the IP's registered geolocation. It is approximate by nature and meaningless behind a CDN — useful for 'is this really hosted where we think', nothing more.