Sample code to execute ping in parallel

ParallelPing.ps1

function Main
{
    $ipAddresses = 1..254 | foreach { "192.168.0.$_" }
    #$ipAddresses | Invoke-ParallelPing | Out-GridView
    Invoke-ParallelPing -ComputerName $ipAddresses | Out-GridView
}


function Invoke-ParallelPing
{
    [CmdletBinding()]
    param (
        [Parameter(Mandatory, ValueFromPipeline)]
        [string[]] $ComputerName,
        [int] $TimeoutMilliseconds = 1000,
        [int] $PingDataSize = 32
    )
    begin
    {
        $ErrorActionPreference = "Stop"
        $pingOptions = New-Object Net.NetworkInformation.PingOptions(64, $false)
        $pingData = New-Object byte[]($PingDataSize)

        $tasks = @()
    }
    process
    {
        $ComputerName | foreach {
            $targetName = $_
            $ping = New-Object Net.NetworkInformation.Ping
            $task = $ping.SendPingAsync($targetName, $TimeoutMilliseconds, $pingData, $pingOptions)
            
            $tasks += [pscustomobject] @{
                ComputerName = $targetName
                Task = $task
                PingObject = $ping
            }
        }
    }
    end
    {
        [Threading.Tasks.Task]::WaitAll($tasks.Task)

        foreach ($task in $tasks)
        {
            [Net.NetworkInformation.PingReply] $result = $task.Task.Result
            [pscustomobject] @{
                Id = $task.Task.Id
                TargetName = $task.ComputerName
                IsSuccess = $result.Status -eq [Net.NetworkInformation.IPStatus]::Success
                Status = $result.Status
                RoundtripTime = $result.RoundtripTime
            }
        }
        foreach ($task in $tasks)
        {
            #TODO:Should be disposed in $task.ContinueWith({}) block
            $task.PingObject.Dispose()
            $task.Task.Dispose()
        }
    }
}

. Main