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Domain footprint: mastercardconnect.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:
216.119.218.157 → MasterCard Technologies LLC
Mail:
mail.global.frontbridge.com
SPF sends via:
deliverygateways.mastercard.com
Separately, 2 organisations whose name resembles “mastercardconnect.com” — these may be unrelated to the domain above.