import socket

import threading

routers = []

lock = threading.Lock()

def search_routers(): 

    routers = []

    local_ips = socket.gethostbyname_ex(socket.gethostname())[2]    # get local IP

    all_threads = []

    for ip in local_ips:

        for i in range(1, 255):

            array = ip.split('.')

            array[3] = str(i)

            new_ip = '.'.join(array)

            t = threading.Thread(target=check_ip, args=(new_ip,) )

            t.start()

            all_threads.append(t)

    for t in all_threads:

        t.join()

def check_ip(new_ip):

    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    s.settimeout(1)

    result = s.connect_ex((new_ip, 80))

    s.close()

    if result == 0:

        lock.acquire()

        print new_ip.ljust(15), ' port 80 is open'

        routers.append((new_ip, 80))

        lock.release()

print 'Searching for routers, please wait...'

search_routers()