PowerShell - List all Subnets with Site Name in Forest

Save as a .ps1. run and exports all Subnets in Forest and Site Names to user profile folder as AD-Subnets.csv

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## Get a list of all domain controllers in the forest

$DcList = (Get-ADForest).Domains | ForEach { Get-ADDomainController -Discover -DomainName $_ } | ForEach { Get-ADDomainController -Server $_.Name -filter * } | Select Site, Name, Domain

## Get all replication subnets from Sites & Services

$Subnets = Get-ADReplicationSubnet -filter * -Properties * | Select Name, Site, Location, Description

## Create an empty array to build the subnet list

$ResultsArray = @()

## Loop through all subnets and build the list

ForEach ($Subnet in $Subnets) {

$SiteName = ""

If ($Subnet.Site -ne $null) { $SiteName = $Subnet.Site.Split(',')[0].Trim('CN=') }

$DcInSite = $False

If ($DcList.Site -Contains $SiteName) { $DcInSite = $True }

$RA = New-Object PSObject

$RA | Add-Member -type NoteProperty -name "Subnet" -Value $Subnet.Name

$RA | Add-Member -type NoteProperty -name "SiteName" -Value $SiteName

$RA | Add-Member -type NoteProperty -name "DcInSite" -Value $DcInSite

$RA | Add-Member -type NoteProperty -name "SiteLoc" -Value $Subnet.Location

$RA | Add-Member -type NoteProperty -name "SiteDesc" -Value $Subnet.Description

$ResultsArray += $RA

}

## Export the array as a CSV file

$ResultsArray | Sort Subnet | Export-Csv .\AD-Subnets.csv -nti

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