PowerShell - Get all AD Site and Subnet Info

Save this as a .ps1, Outputs to screen all Sites in the forest and all Subnets each site has in it.

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$siteDescription=@{}

$siteSubnets=@{}

$subnetDescription=@{}

$sitesDN="LDAP://CN=Sites," + $([adsi] "LDAP://RootDSE").Get("ConfigurationNamingContext")

$subnetsDN="LDAP://CN=Subnets,CN=Sites," + $([adsi] "LDAP://RootDSE").Get("ConfigurationNamingContext")

#get the site names and descriptions

foreach ($site in $([adsi] $sitesDN).psbase.children){

if($site.objectClass -eq "site"){

$siteName=([string]$site.cn).toUpper()

$siteDescription[$siteName]=$site.description[0]

$siteSubnets[$siteName]=@()

}

}

#get the subnets and associate them with the sites

foreach ($subnet in $([adsi] $subnetsDN).psbase.children){

$subnetDescription[[string]$subnet.cn]=$subnet.description[0]

$site=[adsi] "LDAP://$($subnet.siteObject)"

if($site.cn -ne $null){

$siteName=([string]$site.cn).toUpper()

$siteSubnets[$siteName] += $subnet.cn

}else{

$siteDescription["Orphaned"]="Subnets not associated with any site"

if($siteSubnets["Orphaned"] -eq $null){ $siteSubnets["Orphaned"] = @() }

$siteSubnets["Orphaned"] += $subnet.cn

}

}

#write output to screen

foreach ($siteName in $siteDescription.keys | sort){

"$siteName $($siteDescription[$siteName])"

foreach ($subnet in $siteSubnets[$siteName]){

"`t$subnet $($subnetDescription[$subnet])"

}

}

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