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Domain footprint: holz-hauff.de
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:
188.94.251.194 → Mittwald
Mail:
holzhauff-de01b.mail.protection.outlook.com → Microsoft Corporation
SPF sends via:
spf.protection.outlook.com · spf.crsend.com · spf-de.emailsignatures365.com
Separately, 1 organisation whose name resembles “holz-hauff.de” — these may be unrelated to the domain above.