list all private in CIDR

list_all_privateip.sh

#!/bin/bash

isMaster=$(cat /emr/instance-controller/lib/info/instance.json | jq .isMaster)

if ! "${isMaster}" ; then
  echo "slave server"
  exit 0
fi

# consumed ip addres by others including self
aws ec2 describe-network-interfaces  | jq  -r .[][] | grep "PrivateIpAddress" | grep -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | cut -d':' -f 2 | tr -d \" | tr -d , | tr -d " " | sort | uniq > /tmp/ip.txt

cidr=$(ip r | awk '{print $ 1}' | grep '/')

# reserved IP
ipcalc -b $cidr | cut -d'=' -f 2 >>  /tmp/ip.txt
nmap -sL $cidr | awk '/Nmap scan report/{print $NF}' | tr -d '()' | sort -V |  head -n 4 >>  /tmp/ip.txt
nmap -sL $cidr | awk '/Nmap scan report/{print $NF}' | tr -d '()' | sort -V |  tail -n 1 >>  /tmp/ip.txt

# list adresses
nmap -sL $cidr | awk '/Nmap scan report/{print $NF}' | tr -d "()" > /tmp/ip_range.txt

while read line
do
        if  grep -x ${line} /tmp/ip.txt > /dev/null ; then
                echo ${line}
        else
                echo "OK"
                echo -n "${line}" > /tmp/decided.txt
                break
        fi
done < /tmp/ip_range.txt

need nmap install
sudo yum install nmap

#!/bin/bash

#aws ec2 describe-network-interfaces | jq -r .[][].PrivateIpAddress > /tmp/ip.txt

cidr=$(ip r | awk '{print $ 1}' | grep '/')

reserved IP

ipcalc -b $cidr | cut -d'=' -f 2 > /tmp/ip.txt
nmap -sL $cidr | awk '/Nmap scan report/{print $NF}' | tr -d '()' | sort -V | head -n 4 >> /tmp/ip.txt

list adresses

nmap -sL $cidr | awk '/Nmap scan report/{print $NF}' | tr -d "()" > /tmp/ip_range.txt

while read line
do
if grep -x ${line} /tmp/ip.txt > /dev/null ; then
echo ${line}
else
echo "OK"
echo -n "export ASSOATION_IP=${line}" >> ~/.bash_profile
break
fi
done < /tmp/ip_range.txt