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Domain footprint: cogentco.com
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:
cogentco-com.mail.protection.outlook.com → Microsoft Corporation
SPF sends via:
cvent-planner.com · _spf.act-on.net
Separately, 5 organisations whose name resembles “cogentco.com” — these may be unrelated to the domain above.