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Domain footprint: hna.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.
Mail:
hna-de.mail.protection.outlook.com → Microsoft Corporation
SPF sends via:
spf.protection.outlook.com · spf.ippen-media.de · spf.mailjet.com
Separately, 2 organisations whose name resembles “hna.de” — these may be unrelated to the domain above.