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Domain footprint: mrsn.at
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:
193.9.253.212 → Mass Response Service GmbH
Mail:
mail-proxy.massresponse.com → Mass Response Service GmbH ·
mail-proxy2.massresponse.com → Mass Response Service GmbH
Separately, 1 organisation whose name resembles “mrsn.at” — these may be unrelated to the domain above.