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Domain footprint: questdiagnostics.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: 52.232.227.90 → Microsoft Corporation
Mail: cluster4.us.messagelabs.com → Avago Technologies U.S. Inc. · cluster4a.us.messagelabs.com → Google LLC
SPF sends via: spf1.questdiagnostics.com · spf2.questdiagnostics.com

Separately, 2 organisations whose name resembles “questdiagnostics.com” — these may be unrelated to the domain above.

  1. Quest Diagnostics, Inc. 27 netblocks · ARIN registry Routing Unverified name
  2. Quest Diagnostics HTAS India Pvt. Ltd. 1 netblock Routing