Get HostName and IP Address

System.Net.IPHostEntry host =new System.Net.IPHostEntry();
private void Page_Load(object sender, System.EventArgs e)
{
host = System.Net.Dns.GetHostByAddress
 (Request.ServerVariables["REMOTE_HOST"]);

Response.Write(host.HostName+"\n"+"IP :"+
 Request.ServerVariables["REMOTE_ADDR"]);
}