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Domain footprint: duke.edu
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:
duke-edu.mail.protection.outlook.com → Microsoft Corporation
SPF sends via:
%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email
Separately, 1 organisation whose name resembles “duke.edu” — these may be unrelated to the domain above.