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Who can take this down?

For a domain we find the registrar and the network owner of each address it uses. For an IP address we find the network owner.

Looks things up straight from your browser. When you press the button, this page asks registry (RDAP) services, RIPEstat and Google Public DNS directly, with no cookies and no referrer. We never see the lookup. Private addresses and internal names are never sent. Nothing is saved, and reloading clears everything.