Scanning IPv4 addresses in use

scan-ipv4.sh

if [ "$#" -eq 0 ]; then
    targets="70 71 79 91 92 93 94"
else
    targets=$*
fi
echo -e "Targets to scan:\n $targets"

in_use=()
for suffix in $targets; do
    ip=140.113.216.$suffix
    echo -e "\n> nmap -sn $ip -oG -"
    nmap -sn $ip -oG - | grep "Up"
    if [ $? -eq 0 ]; then
        echo "$ip is in use (nmap)"
        in_use+=(\\n$ip)
    fi
done

echo "------"
echo -e "IPs in use: ${in_use[*]}"#!/bin/bash

Usages:

bash scan-ipv4.sh
bash scan-ipv4.sh `seq 65 94`