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Domain footprint: usdf.org
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:
24.142.141.115 → Charter Communications LLC
Mail:
d66665a.ess.barracudanetworks.com → Barracuda Networks, Inc. ·
d66665b.ess.barracudanetworks.com → Barracuda Networks, Inc.
SPF sends via:
spf.protection.outlook.com · spf.ess.barracudanetworks.com · amazonses.com
Separately, 1 organisation whose name resembles “usdf.org” — these may be unrelated to the domain above.