What I learnt at the Winter Scripting Games - Part 1 - Subnet Scanner

We're done with the practice event for the winter scripting games and one of the first requirements was a subnet scanner! I've always wanted one of those! So we wrote one and it's here for you to use;

$MaxThreads = 20 $network = "192.168.92." #$subnet = "24" #TODO... set $rangestart and $rangeend to the appropriate values based of subnet... Anyone know how to achieve that algorithmically? We'll just leave it as a manual setting for now $rangestart = 1 $rangeend = 254 $counter = $rangestart $scriptblock = {param($ip)     $temp ="" | Select-Object IP, Status     $temp.status = "Fail"     $test = $null     $temp.ip = $ip      $test = test-connection $ip -count 1     if ($test -ne $null)     {         $temp.Status = "Success"     }     write-output $temp -NoEnumerate } while ($counter -le $rangeend) {      Write-Progress  -Activity "Pinging $ip" -Status "Waiting for threads to close" -CurrentOperation ("" + $counter + " threads created - " + ((Get-Job -state running).count) + " threads open") -PercentComplete $prog     $prog = ($counter / $rangeend) * 100       $ip = $network + $counter.ToString()     While ($(Get-Job -state running).count -ge $MaxThreads)     {          Write-Progress  -Activity "Pinging $ip" -Status "Waiting for threads to close" -CurrentOperation ("" + $counter + " threads created - " + ((Get-Job -state running).count) + " threads open") -PercentComplete $prog     }     Start-job -ArgumentList $ip, $outputpath -scriptblock $scriptblock -Name ("subnetscans"+$ip) | out-null     $counter++     start-sleep -Milliseconds 200 } $report = Get-Job -Filter "name -like 'subnetscans*'" | Receive-Job -wait $report | select IP, Status

This is a neat example of using start-job to create a multi-threaded script.