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#!/usr/bin/perl

...
  Net::Netmask

=cut

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$ perl find_machines.pl --netblock "192.168.2.0/24"
host 192.168.2.2 is up.
...
host 192.168.2.6 is up.
host 192.168.2.10 is up.
host 192.168.2.19 is up.