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Domain footprint: rupertusbuch.at

Resolved live just now — where this domain's services actually run, with each address attributed by OrgIndex. A DNS observation, not registry data: many organisations run entirely on providers' networks and hold no IP space of their own.

Web: 92.63.216.196 → oja.at GmbH

Mail: mx1-eu1.ppe-hosted.com → Proofpoint, Inc. · mx2-eu1.ppe-hosted.com → Proofpoint, Inc.

SPF sends via: spf.w4ymail.at · spf.protection.outlook.com · _spf-eu.ppe-hosted.com

No organisation is registered under the name "rupertusbuch.at"

The addresses above are where it actually runs — resolved live and attributed to the operator that registered each range. That is the answer for a domain; a name match here would only add something if a company were registered under this name too.

Sites hosted on a provider (OVH, Cloudflare, AWS and the like) show that provider, because the address space is registered to them rather than to the site's owner.