import socket

def _resolve_hostname(ip):
    """Reverse DNS lookup for a single IP."""
    try:
        return socket.gethostbyaddr(ip)[0]
    except Exception:
        return ""

def get_local_ip():
    """Get the local IP address of this machine."""
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.connect(("8.8.8.8", 80))
        ip = s.getsockname()[0]
        s.close()
        return ip
    except Exception:
        return "N/A"

def get_default_network(ip):
    """Guess the /24 network from local IP."""
    try:
        parts = ip.split(".")
        return f"{parts[0]}.{parts[1]}.{parts[2]}.0/24"
    except Exception:
        return "192.168.1.0/24"