# Lokales Subnetz automatisch ermitteln
$localIP = (Get-NetIPAddress -AddressFamily IPv4 -InterfaceAlias Ethernet* | Where-Object {$_.PrefixLength -le 32}).IPAddress
if (-not $localIP) { $localIP = (Get-NetIPAddress -AddressFamily IPv4 | Where-Object {$_.PrefixLength -le 32}).IPAddress }
$subnet = ($localIP -split '\.')[0..2] -join '.'

Write-Host "Scanning subnet $subnet.0/24 ..." -ForegroundColor Cyan

$results = @()

1..254 | ForEach-Object {
    $ip = "$subnet.$_"
    if (Test-Connection -ComputerName $ip -Count 1 -Quiet) {
        # MAC-Adresse über ARP abfragen
        $mac = (arp -a $ip | Select-String $ip) -replace '\s{2,}', ' ' | ForEach-Object { ($_ -split ' ')[1] }
        # Hostname auflösen
        try {
            $hostname = ([System.Net.Dns]::GetHostEntry($ip)).HostName
        } catch {
            $hostname = "unbekannt"
        }
        $results += [PSCustomObject]@{
            IP       = $ip
            MAC      = $mac
            Hostname = $hostname
        }
    }
}

# Ergebnisse ausgeben
$results | Format-Table -AutoSize