check concurrent connection by IP
List all IP, that connecting to 160.45.32.*:80 that more than 20
netstat -pan | grep 160.45.32.[0-9]*:80| awk '{print $5}' | awk -F: '{print $1}' | sort | uniq -c | sort -n | grep '^ *[2-9][0-9][0-9]* ' | awk '{print $2}'