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Domain footprint: seiren.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.
Mail:
seiren-com.mail.protection.outlook.com → Microsoft Corporation
SPF sends via:
_a.seiren.com · spf.protection.outlook.com · spf.w2solution.com · e-grant.ko-sokumail.net · spfgw.fsi.ne.jp · spf.chatdealer.jp
Separately, 2 organisations whose name resembles “seiren.com” — these may be unrelated to the domain above.