Python program which test the connection of a list of IP:PORT and returns the result in a dictionary. It uses non-blocking socket with select and connect_ex.

teste_ips.py

import socket, select

def checkIPs(list_ips):
    socks = []
    fds = {}
    ips = {}
    for k in list_ips:
        ip = k.split(':')
        if len(ip) == 2:
            ips[k] = {'conectado': False}
            s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
            s.setblocking(False)
            try:
                s.connect_ex((ip[0], int(ip[1])))
                socks.append(s)
                fds[s.fileno()] = {'ip': k, 'socket': s}
            except Exception as e:
                print(e)
    while len(socks):
        rl, wl, el = select.select([], socks, [], 2)
        if not wl:
            break
        for w in wl:
            fd = w.fileno()
            dic = fds[fd]
            s = dic['socket']
            if (s.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR) == 0):
                ip = ips[dic['ip']]
                ip['conectado'] = True
                s.close()
            socks.remove(s)
    return ips

if __name__ == '__main__':
    import time
    list_ips = ['{}:80'.format(socket.gethostbyname('google.com')), 
            '{}:80'.format(socket.gethostbyname('yahoo.com')), 
            '{}:80'.format(socket.gethostbyname('uol.com.br')),
            '127.0.0.1:9090',
            '127.0.0.1:9091',
            '127.0.0.1:9092']
    ini = round(time.time()*1000)
    r = checkIPs(list_ips)
    print (r)
    fim = round(time.time()*1000)
    print(fim-ini)