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Domain footprint: tue.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:
131.155.10.135 → Technische Universiteit Eindhoven
Mail:
tue-nl.mail.protection.outlook.com → Microsoft Corporation
SPF sends via:
spfdefault.mail.tue.nl · spf.topdesk.net · smtpeter.com · spf.interconnect.nl · carerix.net
Separately, 2 organisations whose name resembles “tue.nl” — these may be unrelated to the domain above.