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Domain footprint: mdn.co.jp
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:
141.147.161.106 → Oracle Corporation
Mail:
alt1.aspmx.l.google.com → Google LLC ·
alt2.aspmx.l.google.com → Google LLC ·
alt3.aspmx.l.google.com → Google LLC ·
alt4.aspmx.l.google.com → Google LLC
SPF sends via:
_spf.google.com · _spf.impress.co.jp · s.questetra.net
Separately, 1 organisation whose name resembles “mdn.co.jp” — these may be unrelated to the domain above.