查看Google Cloud的IP地址段
for LINE in `dig txt _cloud-netblocks.googleusercontent.com +short | tr " " "\n" | grep include | cut -f 2 -d :`
do
dig txt $LINE +short
done | tr " " "\n" | grep ip4 | cut -f 2 -d : | sort -n
for LINE in `dig txt _cloud-netblocks.googleusercontent.com +short | tr " " "\n" | grep include | cut -f 2 -d :`
do
dig txt $LINE +short
done | tr " " "\n" | grep ip4 | cut -f 2 -d : | sort -n
