Export Domain Controller GUIDs Across Active Directory Forest Using PowerShell

 Troubleshooting Active Directory replication issues becomes much easier when you can quickly identify which domain controller a GUID belongs to. This PowerShell script provides a reliable and scalable way to extract ObjectGUIDs from all domain controllers across your forest and export them to a CSV file for analysis or documentation. Whether you're resolving replication errors, cleaning up stale metadata, or auditing your AD infrastructure, this approach saves time and improves accuracy.

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#############################Script Starts###################################### 

# Replace with your forest name
$forestName = "bbeninfotech.com"
$outputFile = "DC_GUIDs_Forest.csv"

# Create DirectoryContext for the forest
$context = New-Object System.DirectoryServices.ActiveDirectory.DirectoryContext("Forest", $forestName)

# Get the forest object
$forest = [System.DirectoryServices.ActiveDirectory.Forest]::GetForest($context)
$domains = $forest.Domains

# Initialize array to collect results
$results = @()

foreach ($domain in $domains) {
    $domainName = $domain.Name
    Write-Host "`n--- Domain: $domainName ---" -ForegroundColor Cyan

    # Get all DCs in the domain
    $dcs = Get-ADDomainController -Server $domainName -Filter *

    foreach ($dc in $dcs) {
        try {
            # Use Name instead of HostName
            $computer = Get-ADComputer $dc.Name -Server $domainName
            $results += [PSCustomObject]@{
                Domain       = $domainName
                DCName       = $dc.Name
                ObjectGUID   = $computer.ObjectGUID
            }
        } catch {
            Write-Warning "Failed to get ObjectGUID for $($dc.Name) in $domainName"
        }
    }
}

# Export to CSV
$results | Export-Csv -Path $outputFile -NoTypeInformation -Encoding UTF8
Write-Host "`nExported results to $outputFile" -ForegroundColor Green

#############################Script Ends###################################### 

 Active Directory, PowerShell, Domain Controller, ObjectGUID, AD Forest, Replication Error, Repadmin, Metadata Cleanup, AD Troubleshooting, Export to CSV, Directory Services, Forest-Wide Script, AD Automation, IT Admin Tools, Windows Server, AD Health Check