use Socket;
use IO::Socket;

my $machineName = lc($ENV{COMPUTERNAME});
my ($name, $aliases, $addrtype, $length, @addrs) = gethostbyname($machineName);
foreach(@addrs)
{      
   ($a,$b,$c,$d)=unpack ('C4', $_);
   print "$a.$b.$c.$d\n";
}

##</code><code>##

 public static void Main(string[] args)
        {
            IPAddress[] ips;
            ips = Dns.GetHostAddresses(Environment.MachineName);

            foreach (IPAddress ip in ips)
            {
                if (ip.AddressFamily == AddressFamily.InterNetwork)
                    Console.WriteLine("    {0}", ip);
            }
        }