How can I tell which Domain controller I'm authenticated to?

How can I tell which Domain controller I'm authenticated to? Is there a way to do this without local admin?

You can find this through the following command:

echo %LOGONSERVER%

And you don't have to be admin or poweruser to use it. Have a look at the output of this command:

set

To determine computer / server DC use NLTEST:

nltest /dsgetdc:<domain_name> 

To list all DC's with their appropriate site, try:

nltest /dclist:<domain_name>

You don't have to use the FQDN of the domain name or server -- for example, instead of saying /dclist:services.microsoft.com, you can simply type /dclist:services (as long as you are an authenticated member of that domain, of course).

For user authentication and group policy use LOGONSERVER variable:

echo %logonserver%