Thread pool fast scan lan specify port host

fast_scan_lan_port.py

import time
import socket
import websocket
import concurrent.futures


def get_host_address():
    try:

        for addr in socket.gethostbyname_ex(socket.gethostname())[2]:
            if not addr.startswith("127."):
                return addr

        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.connect(("8.8.8.8", 53))
        return s.getsockname()[0]
    except socket.error:
        return socket.gethostbyname(socket.gethostname())


def connect_device(address, port=1234, timeout=0.01):
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(timeout)
        s.connect((address, port))
        s.close()
        return address
    except (socket.timeout, ConnectionError, ConnectionRefusedError, ConnectionResetError):
        return None


start = time.time()
network_seg = ".".join(get_host_address().split(".")[:-1])
all_host = ["{}.{}".format(network_seg, i) for i in range(255)]
with concurrent.futures.ThreadPoolExecutor() as pool:
    valid_host = filter(lambda x: x is not None, pool.map(connect_device, all_host))
print("{}".format(time.time() - start))
print(list(valid_host))