sniff network traffic on a given interface and displays the IP addresses of the machines communicating with the current host (one IP per line)

netsniff.sh

netsniff () {
    sudo tcpdump -i wlan0 -n ip | \
      awk '{ print gensub(/(.*)\..*/,"\\1","g",$3), $4, gensub(/(.*)\..*/,"\\1","g",$5) }' | \
      awk -F " > " '{print $1"\n"$2}'
}