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Domain footprint: tsf.nl
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:
162.159.135.42 → Cloudflare, Inc.
Mail:
tsf-nl.mail.protection.outlook.com → Microsoft Corporation
SPF sends via:
_spf.zivver.com · spf.protection.outlook.com · servers.mcsv.net · spf.mandrillapp.com · mail.zendesk.com · spf.afas.online
Separately, 7 organisations whose name resembles “tsf.nl” — these may be unrelated to the domain above.