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

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6 Answers

up vote 15 down vote accepted

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
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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%
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The %LOGONSERVER% environmental variable.

echo.%LOGONSERVER%

update

Actually, that variable does not seem to exist when I log into an domain account. I'll update my answer if I figure out why.

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This only answers your question if you have Outlook:

I found an interesting feature in Outlook. If you hold Ctrl and right click the icon in the task bar then click connection status it shows you the exchange server your connected to as well as what domain controller you are connected to. I actually found that one answering another question about Exchange connections, great way to recycle answers...

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Where I got this info: superuser.com/questions/304461/… –  Kyle Sep 9 '11 at 14:24
    
This is NOT entirely correct. In the rare situation where you have 2 DC's on site for DIFFERENT domains which both belong to the same forest and which both carry the Directory services, it is possible that you authenticate to your own domains DC while Outlook uses the other DC for the directory services. I have seen this happen. Caused a lot of grief, because adding delegates in Outlook doesn't work properly if your logon DC and the directory server used by Outlook are not in the same domain. –  Tonny Aug 26 '13 at 10:16
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set l will respond with the variables for both localappdata and for logonserver. However, logonserver is the only variable you are interested in, and the one which will tell you the name of the domain controller you authenticated against.

To only get the logonserver information, type set log (which is simply an abbreviation of set logonserver). The name of the domain controller you authenticated against will be returned.

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set L lists all environment variables that begin with the letter L

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Mind explaining what this does? –  soandos Jul 15 '12 at 18:18
    
Seems like it lists all variables starting with the letter L. Try set a for example. –  Peter Jaric Nov 22 '12 at 18:30
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