Public/Network/Get-DNSHostEntryAsync.ps1

function Get-DNSHostEntryAsync {
  <#
.SYNOPSIS
    Performs a DNS Get Host asynchronously
.DESCRIPTION
    Performs a DNS Get Host asynchronously
.EXAMPLE
    Get-DNSHostEntryAsync -Computername google.com,prox-hyperv,bing.com, github.com, powershellgallery.com, powershell.org
.EXAMPLE
    Get-DNSHostEntryAsync -ComputerName 8.8.8.8, ibm.com
 
    Would return:
    ComputerName Result
    ------------ ------
    8.8.8.8 dns.google
    ibm.com 129.42.38.10
.OUTPUTS
    Net.AsyncGetHostResult
.NOTES
    Inspired by: Get-DNSHostEntryAsync by Boe Prox
 
    Changes:
    * added example to comment based help
    * slight formatting changes
#>


  #Requires -Version 3.0
  [OutputType('Net.AsyncGetHostResult')]
  [CmdletBinding(ConfirmImpact = 'None')]
  Param (
    [parameter(ValueFromPipeline)]
    [Alias('CN', 'Server')]
    [string[]] $ComputerName
  )

  begin {
    Write-Invocation $MyInvocation
    $Computerlist = New-Object -TypeName System.Collections.ArrayList
    if ($PSBoundParameters.ContainsKey('ComputerName')) {
      $null = $Computerlist.AddRange($ComputerName)
    } else {
      $IsPipeline = $True
    }
  }

  process {
    If ($IsPipeline) {
      $null = $Computerlist.Add($ComputerName)
    }
  }

  end {
    $Task = ForEach ($Computer in $Computername) {
      If (([bool]($Computer -as [ipaddress]))) {
        [pscustomobject] @{
          Computername = $Computer
          Task         = [system.net.dns]::GetHostEntryAsync($Computer)
        }
      } Else {
        [pscustomobject] @{
          Computername = $Computer
          Task         = [system.net.dns]::GetHostAddressesAsync($Computer)
        }
      }
    }
    try {
      $null = [Threading.Tasks.Task]::WaitAll($Task.Task)
    } catch { Write-Error -Message 'Error encountered' }
    $Task | ForEach-Object {
      $Result = if ($_.Task.IsFaulted) {
        $_.Task.Exception.InnerException.Message
      } else {
        if ($_.Task.Result.IPAddressToString) {
          $_.Task.Result.IPAddressToString
        } else {
          $_.Task.Result.HostName
        }
      }
      $Object = [pscustomobject] @{
        ComputerName = $_.Computername
        Result       = $Result
      }
      $Object.pstypenames.insert(0, 'Net.AsyncGetHostResult')
      $Object
    }
    Out-Verbose $fxn "Complete."
  }
}