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Domain footprint: tongdun.net
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:
121.43.140.158 → ALISOFT
SPF sends via:
spf.mxhichina.com
Separately, 6 organisations whose name resembles “tongdun.net” — these may be unrelated to the domain above.