至少 DNS 肯定用的是亚马逊的 Route 53
jt136@sabbat ~> ping mail.163.com
PING mail163.ntes53.netease.com (54.64.105.68) 56(84) bytes of data.
64 bytes from ec2-54-64-105-68.ap-northeast-1.compute.amazonaws.com (54.64.105.68): icmp_seq=1 ttl=41 time=177 ms
64 bytes from ec2-54-64-105-68.ap-northeast-1.compute.amazonaws.com (54.64.105.68): icmp_seq=2 ttl=41 time=177 ms
64 bytes from ec2-54-64-105-68.ap-northeast-1.compute.amazonaws.com (54.64.105.68): icmp_seq=3 ttl=41 time=177 ms
64 bytes from ec2-54-64-105-68.ap-northeast-1.compute.amazonaws.com (54.64.105.68): icmp_seq=4 ttl=41 time=177 ms
64 bytes from ec2-54-64-105-68.ap-northeast-1.compute.amazonaws.com (54.64.105.68): icmp_seq=5 ttl=41 time=177 ms
64 bytes from ec2-54-64-105-68.ap-northeast-1.compute.amazonaws.com (54.64.105.68): icmp_seq=6 ttl=41 time=177 ms
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