Powershell script to check which hosts have a port open. You can use it without any arguments to scan local addresses [192.168.1.2 - 192.168.1.30] for port 22, or use the arguments at the top to specify various properties.

portcheck.ps1

param(
    [string]$HostPrefix = "192.168.1.",
    [int]$Port = 22,
    [int]$StartIndex = 2,
    [int]$EndIndex = 30,
    [int]$ConnectTimeout = 150
)

function testport ($hostname, $port, $timeout) {
    $client = New-Object System.Net.Sockets.TcpClient
    $beginConnect = $client.BeginConnect($hostname, $port, $null, $null)
    Start-Sleep -milli $timeout
    if ($client.Connected) { $open = $true } else { $open = $false }
    $client.Close()
    return $open
}

"Trying port [$Port] for [$HostPrefix$StartIndex...$HostPrefix$EndIndex]"
For ($i=$StartIndex; $i-le $EndIndex; $i++){
    $_host="$HostPrefix$i"
    $res = testport $_host $Port $ConnectTimeout
    if($res -eq $true){
        "$_host [open]"
    }
}