import subprocess

subnet = "192.168.3."
for i in range(1, 255):
    ip = f"{subnet}{i}"
    result = subprocess.run(['ping', '-n', '1', '-w', '1000', ip],
                            stdout=subprocess.DEVNULL,
                            stderr=subprocess.DEVNULL)
    if result.returncode == 0:
        print(f"{ip} is active")