DNS Pollution Check

Resolve a domain via multiple public DNS servers and compare results to detect DNS pollution / hijacking

Queries A records from domestic (Aliyun, Tencent DNSPod) and overseas (Google, Cloudflare) public DNS and compares them.
Consistent results mean normal resolution; inconsistent results may indicate DNS pollution/hijacking or regional CDN resolution (common for domestic sites). Judge together with IP geolocation.

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