If you are in an organisation which covers everything under aliases but need to know those ips or hostnames I´ve built a little tool for this. I kept pinging the aliases and using nbtstat -A everyday to find this out and finally I lacked and made myself this little commandline tool for fixing it. The code is simple and you can download both solution and binaries below:

using System;
using System.Net;

namespace GetHostname {
    class Program {
        static void Main (string[] args) {
            // Bool for wether or not the application should be "paused" before quitting
            bool haltForKey = false;

            // If we dont have any arguments from commandline
            if (args.Length == 0) {
                // Request user to input, exit if no input is given
                Console.Write ("Enter alias or ip seperated by space: ");
                var line = Console.ReadLine ();
                if (string.IsNullOrEmpty (line))
                    return;

                // Split all input values
                args = line.Trim ().Split (' ');

                // Mark that manual input has been given and as such halt before quitting
                haltForKey = true;
            }

            // Print the results
            Console.WriteLine ();
            foreach (var entry in args)
                Console.WriteLine (entry + ": " + FindHostName (entry));

            // If user input was given halt execution before exiting
            // (this is mainly for when debugging or executing outside command line window)
            if (haltForKey)
                Console.ReadKey ();
        }

        private static string FindHostName (string input) {
            try {
                // We don't know if we´ve got an alias or ip so get the host data so we can retrieve the IP
                // it´s not actually neccessary but it saves us some complexity in code
                var ipByInput = Dns.GetHostEntry (input);

                // Then retrieve an entry by using the actual ip adress, this´ll give us the hostname which we return
                var hostName = Dns.GetHostEntry (ipByInput.AddressList[0]);
                return hostName.HostName;
            } catch (Exception e) {
                // Always catch any error, in this case we won't bother with stacktraces and somesuch
                return "Failed to find hostname: " + e.Message;
            }
        }
    }
}