今天在思考一個問題
要不要把google的ip全部設成白名單
但首先要取得google的全部ip
指令如下

nslookup -q=TXT _netblocks.google.com 8.8.8.8

目前得到的資料如下

nslookup -q=TXT _netblocks.google.com 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53

Non-authoritative answer:
_netblocks.google.com text = "v=spf1 ip4:64.18.0.0/20 ip4:64.233.160.0/19 ip4:66.102.0.0/20 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:74.125.0.0/16 ip4:108.177.8.0/21 ip4:173.194.0.0/16 ip4:207.126.144.0/20 ip4:209.85.128.0/17 ip4:216.58.192.0/19 ip4:216.239.32.0/19 ~all"

http://itindex.net/detail/50310-google-ip-%E6%96%B9%E6%B3%95