NetBIOS domain of computer in PowerShell

Question

How can I get the NetBIOS (aka \'short\') domain name of the current computer from PowerShell?

$ENV:USERDOMAIN displays the domain of the current user, but I want th

Answer 1

Using NetGetJoinInformation and P/Invoke:

Add-Type -MemberDefinition @"
[DllImport("netapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern uint NetApiBufferFree(IntPtr Buffer);
[DllImport("netapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern int NetGetJoinInformation(
  string server,
  out IntPtr NameBuffer,
  out int BufferType);
"@ -Namespace Win32Api -Name NetApi32

function GetDomainName {
  $pNameBuffer = [IntPtr]::Zero
  $joinStatus = 0
  $apiResult = [Win32Api.NetApi32]::NetGetJoinInformation(
    $null,               # lpServer
    [Ref] $pNameBuffer,  # lpNameBuffer
    [Ref] $joinStatus    # BufferType
  )
  if ( $apiResult -eq 0 ) {
    [Runtime.InteropServices.Marshal]::PtrToStringAuto($pNameBuffer)
    [Void] [Win32Api.NetApi32]::NetApiBufferFree($pNameBuffer)
  }
}

Answer 2

This can also be done by using .NET framework (which is much faster than WMI)

PS > [System.Net.NetworkInformation.IPGlobalProperties]::GetIPGlobalProperties()

Will return

HostName      : SurfaceBook
DomainName    : mydomain.com
NodeType      : Hybrid
DhcpScopeName :
IsWinsProxy   : False

Answer 3

import-module activedirectory
(Get-ADDomain -Identity (Get-WmiObject Win32_ComputerSystem).Domain).NetBIOSName

Answer 4

From Here

# Retrieve Distinguished Name of current domain.
$Domain = [System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain()
$Root = $Domain.GetDirectoryEntry()
$Base = ($Root.distinguishedName)

# Use the NameTranslate object.
$objTrans = New-Object -comObject "NameTranslate"
$objNT = $objTrans.GetType()

# Invoke the Init method to Initialize NameTranslate by locating
# the Global Catalog. Note the constant 3 is ADS_NAME_INITTYPE_GC.
$objNT.InvokeMember("Init", "InvokeMethod", $Null, $objTrans, (3, $Null))

# Use the Set method to specify the Distinguished Name of the current domain.
# Note the constant 1 is ADS_NAME_TYPE_1779.
$objNT.InvokeMember("Set", "InvokeMethod", $Null, $objTrans, (1, "$Base"))

# Use the Get method to retrieve the NetBIOS name of the current domain.
# Note the constant 3 is ADS_NAME_TYPE_NT4.
# The value retrieved includes a trailing backslash.
$strDomain = $objNT.InvokeMember("Get", "InvokeMethod", $Null, $objTrans, 3)

Answer 5

Use env: to get environment settings through PowerShell

NetBIOS: $env:userdomain

FQDN: $env:userdnsdomain

To see all the values:

dir env:  (no $)

Answer 6

In most cases, the default NetBIOS domain name is the leftmost label in the DNS domain name up to the first 15 bytes (NetBIOS names have a limit of 15 bytes). The NetBIOS domain name may be changed during the installation of the Active Directory, but it cannot be changed.

The WIN32_ComputerSystem WMI object gives informations on a Windows computer

PS C:\> Get-WmiObject Win32_ComputerSystem

Domain              : WORKGROUP
Manufacturer        : Hewlett-Packard
Model               : HP EliteBook 8530w (XXXXXXXXX)
Name                : ABCHPP2
PrimaryOwnerName    : ABC
TotalPhysicalMemory : 4190388224

So the domain Name is given by :

PS C:\> (gwmi WIN32_ComputerSystem).Domain

But in domain installation, the DNS name is given. In this case, you can use nbtstat -n command to find the NetBIOS domain name which is displayed like this <DOMAIN><1B>.

The PowerShell Command may be :

nbtstat -n | Select-String -Pattern "^ *(.*) *<1B>.*$" | % {$_ -replace '^ *(.*) *<1B>.*$','$1'}

Here is another way using WMI

PS C:\> (gwmi Win32_NTDomain).DomainName