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Domain footprint: zhihu.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.
Web:
43.135.83.2 → ACEVILLEPTELTD-SG
Mail:
mxbiz1.qq.com → DeepIDC Technology International Co., Limited ·
mxbiz2.qq.com → ACEVILLEPTELTD-SG
SPF sends via:
spf.mail.qq.com
Separately, 9 organisations whose name resembles “zhihu.com” — these may be unrelated to the domain above.