Getting Google IP ranges
Google puts them into SPF records ?! dig +short txt _cloud-netblocks.googleusercontent.com | sed 's/"//g; s/ip4://g;' | tr ' ' '\n' | grep include | cut -d ':' -f2 | xargs dig +short txt | sed 's/"//g; s/ip4://g;' | tr ' ' '\n' | grep '/' responds with 8.34.208.0/20 8.35.192.0/21 8.35.200.0/23 108.59.80.0/20 108.170.192.0/20 108.170.208.0/21 108.170.216.0/22 108.170.220.0/23 108.170.222.0/24 162.216.148.0/22 162.222.176.0/21 173.255.112.0/20 192.158.28.0/22 199.192.112.0/22 199.223.232.0/22 199.223.236.0/23 23.236.48.0/20 23.251.128.0/19 107.167.160.0/19 107.178.192.0/18