Scans to see if an IP is listening on a given port.

portscan.ps1

param (
    [int]$port,
    [string]$ip
)

if (Test-Connection -BufferSize 32 -Count 1 -Quiet -ComputerName $ip) {
    
    $socket = new-object System.Net.Sockets.TcpClient($ip, $port)
    if ($socket.Connected) {
        write-host "$ip is listening on port $port"
        $socket.Close()
    }
    else {
        write-host "$ip NOT listening on port $port"
    }
}