Azure | List | Subscription(s) + VNet(s) + Subnet(s)

azure_vnets_subnets.ps1

$Subs = Get-AzureRmSubscription
foreach ($Sub in $Subs) {
  $SelectSub = Select-AzureRmSubscription -SubscriptionName $Sub.Name
  $VNETs = Get-AzureRmVirtualNetwork
  foreach ($VNET in $VNETs) {
    #$Sub.Name
    #$VNET.Name
    #$VNET.AddressSpace.AddressPrefixes
    Write-Host "$($Sub.Name),$($VNET.Name),$($VNET.AddressSpace.AddressPrefixes)"
  }
}