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Domain footprint: customer.io
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:
76.76.21.21 → Vercel, Inc
Mail:
alt1.aspmx.l.google.com → Google LLC ·
alt2.aspmx.l.google.com → Google LLC ·
aspmx.l.google.com → Google LLC ·
aspmx2.googlemail.com → Google LLC
SPF sends via:
helpscoutemail.com · _spf.google.com · servers.mcsv.net · amazonses.com · mail.zendesk.com