B 站 CDN 是不是只有用国内 DNS 才会返回国内节点 IP

即使用支持 ECS 的海外 DOH 带上国内 IP 查询，也只会返回香港/新加坡/日本的 IP 。

curl -H "accept: application/dns-json" "https://dns.google/resolve?name=upos-sz-mirroraliov.bilivideo.com&edns_client_subnet=101.6.6.0/24"
{"Status":0,"TC":false,"RD":true,"RA":true,"AD":false,"CD":false,"Question":[{"name":"upos-sz-mirroraliov.bilivideo.com.","type":1}],"Answer":[{"name":"upos-sz-mirroraliov.bilivideo.com.","type":5,"TTL":156,"data":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com."},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"128.1.157.225"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"128.1.157.229"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"128.1.157.231"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"128.1.157.228"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"128.1.157.232"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"128.1.157.227"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"128.1.157.226"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"128.1.157.230"}],"edns_client_subnet":"101.6.6.0/24","Comment":"Response from 47.89.91.91."}

curl -H "accept: application/dns-json" "https://223.5.5.5/resolve?name=upos-sz-mirroraliov.bilivideo.com&edns_client_subnet=101.6.6.0/24"
{"Status":0,"TC":false,"RD":true,"RA":false,"AD":false,"CD":false,"Question":{"name":"upos-sz-mirroraliov.bilivideo.com.","type":1},"Answer":[{"name":"upos-sz-mirroraliov.bilivideo.com.","TTL":60,"type":5,"data":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com."},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","TTL":60,"type":1,"data":"163.181.201.235"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","TTL":60,"type":1,"data":"163.181.201.238"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","TTL":60,"type":1,"data":"163.181.201.237"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","TTL":60,"type":1,"data":"163.181.201.234"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","TTL":60,"type":1,"data":"163.181.201.236"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","TTL":60,"type":1,"data":"163.181.201.231"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","TTL":60,"type":1,"data":"163.181.201.232"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","TTL":60,"type":1,"data":"163.181.201.233"}],"edns_client_subnet":"101.6.6.0/24"

带上美国 IP 能正常返回美国节点

curl -H "accept: application/dns-json" "https://dns.google/resolve?name=upos-sz-mirroraliov.bilivideo.com&edns_client_subnet=89.208.246.0/24"
{"Status":0,"TC":false,"RD":true,"RA":true,"AD":false,"CD":false,"Question":[{"name":"upos-sz-mirroraliov.bilivideo.com.","type":1}],"Answer":[{"name":"upos-sz-mirroraliov.bilivideo.com.","type":5,"TTL":470,"data":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com."},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"8.45.52.202"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"8.45.52.227"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"8.45.52.203"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"8.45.52.228"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"8.45.52.230"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"8.45.52.229"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"8.45.52.201"},{"name":"upos-sz-mirroraliov.bilivideo.com.queniuaa.com.","type":1,"TTL":60,"data":"8.45.52.204"}],"edns_client_subnet":"89.208.246.0/24","Comment":"Response from 47.240.195.222."}

这个特性让 Chrome 的安全 DNS 挂海外 DOH 时在透明代理环境下没办法正常浏览 B 站，因为代理软件会用 Chrome 给的海外 IP 匹配直连域名规则，连主页都要加载半天。