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Samselvaprabu
Asked: 2021-12-02 08:59:45 +0800 CST

How to find Free IP address in a sub range?

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We are using below command to figure out the IP addresses which are down (which is free IP address to use)

nmap -v -sn -n 192.168.1.0/24 -oG - | awk '/Status: Down/{print $2}'

I wanted to get a subrange within that . For example the above command shows all the free IP address from 192.168.1.1 to 192.168.1.124. [ Note: This is for test automation and we are using static IP addresses. Multiple team members are sharing range of IP addresses but often overstep other's range. So this will help us to decide whether IP is really free at that moment before using it)

But I want to find free IP address within the range of

192.168.1.55 to 192.168.1.65

. How to do it?

linux

0 Answers

  1. Best Answer

    With nmap you can scan range in a sub-net with this syntax (i.e to scan 192.168.0.1 to 192.168.1.30 only) :

    nmap  192.168.0.1-30

    So you should easily be able to adapt it with your command :

    nmap -v -sn -n 192.168.1.55-65 -oG - | awk '/Status: Down/{print $2}'
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