UdpPortTest.ps1

$target = '8.8.8.8'
$udpPort = 53
$packetSize = 64

### Using UdpClient

[byte[]]$packet = [byte[]]::new($packetSize)
$udpClient = [System.Net.Sockets.UdpClient]::new()
$udpClient.Client.ReceiveTimeout = 1000
$ipEndPoint =  [System.Net.IPEndPoint]::new([System.Net.IPAddress]::Any, 0)

try {
    $udpClient.Connect($target, $port)
    $null = $udpClient.Send($packet, $packetSize)
    $null = $udpClient.Receive([ref]$ipEndPoint)
    Write-Host "Port $port on $target replies"
}
catch {
    Write-Host $($_.Exception.Message)
    Write-Host "Port $port on $target does not reply"
}