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Domain footprint: redsix.cz
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:
185.175.85.22 → FORTION-SERVERS
Mail:
mx.cekit.cz → BRNO-HOUSING6-CZ-MAI
SPF sends via:
_spf.fortion.net · _spf.cekit.cz · ppl.cz
Separately, 3 organisations whose name resembles “redsix.cz” — these may be unrelated to the domain above.