basic-port-scan.ps1

# Define ports to check
$ports = @(22, 53, 80, 443, 445)

# Get IPs from arp -a
$ips = arp -a | ForEach-Object {
    if ($_ -match '(\d+\.\d+\.\d+\.\d+)') {
        $matches[1]
    }
} | Where-Object { $_ -ne "0.0.0.0" -and $_ -ne "255.255.255.255" }

# Function to check open ports
function Check-Port {
    param (
        [string]$ip,
        [int]$port
    )
    $tcp = New-Object System.Net.Sockets.TcpClient
    if ($tcp.ConnectAsync($ip, $port).Wait(100)) {
        Write-Output "Port $port is OPEN on $ip"
    }
    $tcp.Close()
}

# Loop through IPs and ports, only print open ports
foreach ($ip in $ips) {
    foreach ($port in $ports) {
        Check-Port -ip $ip -port $port
    }
}