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 the domain that the current machine is a member of.

I've discovered you can do it pretty easily in VBScript, but apparently ADSystemInfo isn't very nice to use in PowerShell.

Update

Here's my final solution incorporating the suggestion of using Win32_NTDomain, but filtering to the current machine's domain

$wmiDomain = Get-WmiObject Win32_NTDomain -Filter "DnsForestName = '$( (Get-WmiObject Win32_ComputerSystem).Domain)'"
$domain = $wmiDomain.DomainName

Answer 1

OP is after "computer domain" so the answer would be $GetComputerDomain (below) but I will add the $GetUserDomain also for reference.

$GetComputerDomain = ([System.DirectoryServices.ActiveDirectory.Domain]::GetComputerDomain()).Name
$GetUserDomain = ([System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain()).Name

I find the wmi (gwmi) option to be extremely slow, especially, when you are querying the Win32_NTDomain class. I have a multi-trusted domain environment and it takes forever when I just need that simple info quick.

Answer 2

The below powershell command works great! I tested after trying various solutions.

If you use the following .Net command:

 [System.Net.Dns]::GetHostByAddress('192.168.1.101').hostname

It works too, but it is using DNS to resolve, in my case, we have WINS setup to support an application that requires it, so can't use it. Below is what I ended up using as part of a script I use to check for WINS registration for each client:

$IPAddress = "<enterIPAddress>" (remove brackets, just enter IP address)

(nbtstat -A $IPAddress | ?{$_ -match '\<00\>  UNIQUE'}).Split()[4]

http://social.technet.microsoft.com/Forums/en-US/f52eb2c7-d55d-4d31-ab4e-09d65d366771/how-to-process-cmd-nbtstat-a-ipaddress-output-and-display-the-computer-name-in-powershell?forum=ITCG

The above link has the thread and conversation.

Answer 3

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