I recently encountered this scenario and thought of blogging about it. To get the machine name of the logged in user, you can use the “GetHostEntry()” method provided in System.Net.Dns class.
GetHostEntry takes a string as parameter and it is the hostname or address of the machine whose entry we need to get. So in order to get the machine name, we need to make use of the server variable remote_addr.
GetHostEntry returns an IPHostEntry object and its HostName property would give the machine name of the logged in user. So the line of code would be
Hope this helps!