Shell script to get public Google Cloud IP ranges

get_google_ranges.sh

#!/usr/bin/env bash
#set -x
#trap read debug

URL="_cloud-netblocks.googleusercontent.com"

get_ranges() {
	local includes=($(host -t TXT "$1"| egrep -o "include:_cloud-[^ ]*" | cut -d':' -f2))
	local ranges=($(host -t TXT "$1" | egrep -o "ip4:((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?/([0-9]?[1-3][0-9]))" | cut -d':' -f2))

	#echo "${ranges[@]}"
	[ ! -z $ranges ] && printf '%s\n' "${ranges[@]}"
	if [ ! -z $includes ]; then
		for include in "${includes[@]}"; do
			get_ranges "$include"
		done
	fi
}

get_ranges "$URL" | sort -t'.' -n -k1,1 -k2,2 -k3,3 -k4,4 | uniq