A quick script that lists unused IPs within a specified range. This script employs nmap and takes advantage of it’s support for multiple ways of specifying IPs (CIDR, Range, etc). The script starts by doing a ping of the IP, if the IP doesn’t respond the script further verifies the IPs availability by scanning common ports.  By pinging before port scanning you eliminate the majority of IPs that are being utilized. You can change the ports to scan with the services variable.

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