How to get computer name which is in another domain or network

Hi, I have a computer (MyPc) in "ABC" domain and my webserver is in "XYZ" domain at the same time both are having a different DNS.

Now i need to get the hostname of my computer which is in "ABC" domain when i am sending request from "XYZ" network. I have used the below codes but it is giving IP address of the computer instead of hostname. IP

HostEntry host;

IPAddress address = IPAddress.Parse(ipaddr);

host = Dns.GetHostEntry(address); Console.WriteLine(host.HostName.ToString());

string[] computer_name = System.Net.Dns.GetHostEntry(Request.ServerVariables["remote_host"]).HostName.Split(new Char[] { '.' });

string clientPCName = System.Net.Dns.GetHostEntry(Request.UserHostAddress).HostName.ToString(); Pl

ease help me with the code to queries the DNS of the client, not the Server.