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%sites = {
  site1 => [ '192.168.1.0/24', '10.10.10.0/24', '4.5.6.7/255.255.255.1
+92'],
  site2 => [ '1.2.3.4/255.255.255.240', '10.1.1.1/255.255.255.252']
  ...
  };

%sites = (
  site1 => { 
...
    },
    ...
    );

  $sites{'site1'}{'ipinfo'} = Net::CIDR::Lite->new;

  $cidr = Net::CIDR::Lite->new;
  $sites{'site1'}{'ipinfo'} = $cidr->add_cidr('192.168.1.0/24');