我无法列出google.com或fb.com的所有dns服务器ips，但是如果我尝试使用apple.com或microsoft.com，我会看到多个ips。公司如何以及如何隐藏它？
nslookup apple.com
Server: 10.10.90.50
Address: 10.10.90.50#53
Non-authoritative answer:
Name: apple.com
Address: 17.142.160.59
Name: apple.com
Address: 17.178.96.59
Name: apple.com
Address: 17.172.224.47
nslookup google.com
Server: 10.10.90.50
Address: 10.10.90.50#53
Non-authoritative answer:
Name: google.com
Address: 172.217.5.110