VB.NET – List all domain controllers in domain

July 16, 2010 — 3 Comments

Here is a little VB.NET function I’ve written that will provide you with the names of all of the domain controllers in your Active Directory domain – note that you need to add a reference to System.DirectoryServices first.

Private Function GetDomainControllers() As List(Of String)
    Dim DcList As New List(Of String)

    Using Searcher As New DirectorySearcher(New DirectoryEntry)
        Searcher.Filter = "(primaryGroupID=516)"
        For Each DC As SearchResult In Searcher.FindAll
            DcList.Add(DC.GetDirectoryEntry.Name.Remove(0, 3))
    End Using

    Return DcList
End Function

EDIT: I just found that there is a much simpler way of doing this! You simply loop through the DomainControllers collection like so:

For Each DC As DirectoryServices.ActiveDirectory.DomainController In DirectoryServices.ActiveDirectory.Domain.GetCurrentDomain.DomainControllers
            'You can get all sorts of useful info from the DomainController object
            'but here is a simple example of getting the name and IP
            MessageBox.Show(DC.Name & " – " & DC.IPAddress)

Hope it is of some use to someone in the future.


3 responses to VB.NET – List all domain controllers in domain


    AWSOMMME thx chris this is just what i needed 😉 me happy

    Peter Sutton July 23, 2012 at 10:50

    thx chris. do you have a similar function to show all domains in the forest? i am using the below code however it is terribly slow.. is there a better way to do this?

    Dim domains As DomainCollection = Forest.GetCurrentForest.Domains
    For Each domain As Domain In domains


      Hi Peter,

      That’s how I would do it, if it is slow then I would guess it is slow links or DNS problems that are causing the speed issue.

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