First get the json with all the IP ranges

wget https://developers.google.com/static/crawling/ipranges/common-crawlers.json -O google.txt

Use this script to get the results.  It may be smart to grep on "time=" to just get the IPs that returned results/were pingable.

for ip in `cat google.txt |grep ipv4|cut -f 2 -d :|sed 's#"##g'|cut -f 1 -d /`; do
 o1=`echo $ip|cut -f 1 -d .`
 o2=`echo $ip|cut -f 2 -d .`
 o3=`echo $ip|cut -f 3 -d .`
 o4=`echo $ip|cut -f 4 -d .`
 if [ "$o4" == "0" ]; then
   o4=1
 fi
echo ping -w 1 -c 1 $o1.$o2.$o3.$o4 
ping -w 1 -c 1 $o1.$o2.$o3.$o4
done

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