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........