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Domain footprint: healthstream.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.
Web:
192.140.6.197 → HealthStream, Inc.
Mail:
healthstream-com.mail.protection.outlook.com → Microsoft Corporation
SPF sends via:
spf.salesforce.com · spf.zoho.com · zcsend.net · amazonses.com · sendgrid.net · spf.protection.outlook.com
Separately, 4 organisations whose name resembles “healthstream.com” — these may be unrelated to the domain above.