Delete all AWS Default VPCs with PowerShell

delete-default-vpcs.ps1

#Requires -Module @{ModuleName="AWSPowerShell";ModuleVersion="3.3.450.0"}

Write-Output -InputObject 'Delete all Default VPCs'
$AllRegions = Get-EC2Region
ForEach ($region in $AllRegions.RegionName) {
  Write-Output -InputObject "Searching $region"
  $defaultVpc = Get-EC2VPC -Filter @{name='isDefault'; Value='true'} -Region $region
  if ($defaultVpc) {
    Write-Output -InputObject "Found default VPC $($defaultVPC.VpcId) $($defaultVPC.CidrBlock) ... deleting"
    $VPCFilter = New-Object -TypeName Amazon.EC2.Model.Filter
    $VPCFilter.Value = $($defaultVPC.VpcId)

    $VPCFilter.Name = 'attachment.vpc-id'
    $igw = Get-EC2InternetGateway -Filter $VPCFilter -Region $region
    if ($igw) { Dismount-EC2InternetGateway -VpcId $($defaultVPC.VpcId) -InternetGatewayId $igw.InternetGatewayId -Region $region }
    if ($igw) { Remove-EC2InternetGateway -InternetGatewayId $igw.InternetGatewayId -Region $region -Force }

    $egw = Get-EC2EgressOnlyInternetGatewayList -Region $region
    if ($egw) { Remove-EC2EgressOnlyInternetGateway -EgressOnlyInternetGatewayId $egw.EgressOnlyInternetGatewayId -Region $region -Force }

    $VPCFilter.Name = 'vpc-id'
    $neti = Get-EC2NetworkInterface -Filter $VPCFilter -Region $region
    foreach ($eni in $neti) {
      #if ($eni.Attachment) { Dismount-EC2NetworkInterface -AttachmentId $eni.Attachment.AttachmentId -ForceDismount $true -Region $region }
      Remove-EC2NetworkInterface -NetworkInterfaceId $eni.NetworkInterfaceId -Region $region -Force
    }

    $VPCFilter.Name = 'requester-vpc-info.vpc-id'
    Get-EC2VpcPeeringConnection -Filter $VPCFilter -Region $region | Remove-EC2VpcPeeringConnection -Region $region

    $VPCFilter.Name = 'accepter-vpc-info.vpc-id'
    Get-EC2VpcPeeringConnection -Filter $VPCFilter -Region $region | Remove-EC2VpcPeeringConnection -Region $region

    $VPCFilter.Name = 'vpc-id'
    Get-EC2Subnet -Filter $VPCFilter -Region $region | Remove-EC2Subnet -Region $region -Force

    Remove-EC2VPC -VpcId $($defaultVPC.VpcId) -Region $region -Force
    Write-Output -InputObject "VPC $($defaultVPC.VpcId) $($defaultVPC.CidrBlock) ... DELETED"

    Get-EC2SecurityGroup -Filter $VPCFilter -Region $region | Remove-EC2SecurityGroup -Region $region -Force

    Get-EC2NetworkACL -Filter $VPCFilter -Region $region | Remove-EC2NetworkACL -Region $region -Force

    $VPCFilter.Name = 'vpc-id'
    $rtb = Get-EC2RouteTable -Filter $VPCFilter -Region $region
    if ($rtb) { Unregister-EC2RouteTable -AssociationId $rtb.Associations.RouteTableAssociationId -Region $region }
    if ($rtb) { Remove-EC2RouteTable -RouteTableId $rtb.RouteTableId -Region $region -Force }
  }
}