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Domain footprint: pku.edu.cn
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:
162.105.131.160 → China Education and Research Network (CERNET)
Mail:
gateway.pku.edu.cn → China Education and Research Network (CERNET) ·
mx-pku-edu-cn.icoremail.net → UCLOUD-US
SPF sends via:
spf.icoremail.net
Separately, 1 organisation whose name resembles “pku.edu.cn” — these may be unrelated to the domain above.