google.com如何处理只有一个IP的web流量？

Question

我在google.com上运行了nslookup。仅返回一个IP。

google.com如何处理只有一个IP的web流量？

nslookup google.com
Server:     8.8.8.8
Address:    8.8.8.8#53

Non-authoritative answer:
Name:   google.com
Address: 216.58.194.174

相比之下，在stackoverflow.com上查找会返回4个IP地址。

nslookup www.stackoverflow.com
Server:     8.8.8.8
Address:    8.8.8.8#53

Non-authoritative answer:
www.stackoverflow.com   canonical name = stackoverflow.com.
Name:   stackoverflow.com
Address: 151.101.1.69
Name:   stackoverflow.com
Address: 151.101.65.69
Name:   stackoverflow.com
Address: 151.101.129.69
Name:   stackoverflow.com
Address: 151.101.193.69

Answer 1

Google维护IP地址8.8.8.8和8.8.4.4作为Google公共DNS的主要和次要DNS地址。在战略上位于世界各地的DNS服务器网络支持这些地址上的查询。

以下公网网段属于Google.com: 64.233.160.0 - 64.233.191.255 66.102.0.0 - 66.102.15.255 66.249.64.0 - 66.249.95.255 72.14.192.0 - 72.14.255.255 74.125.0.0 - 74.125.255.255 209.85.128.0 - 209.85.255.255 216.239.32.0 - 216.239.63.255