example5

#!/bin/bash
#ulstrafast lan scanner
#https://consolechars.wordpress.com/2017/03/27/devtcp-forgotten-linux-delicacy/
iph="192.168.8."
scan (){
  timeout 3 bash -c "echo >/dev/tcp/$iph$2/$1" 2>/dev/null &&    echo "$iph$2    $1"
}
echo "PORT            HOST"
for ihost in {1..254}; do
  for port in {22,80,8080,3389,443,53,67,68}; do
    scan $port $ihost &
  done

done