python ping.py --ips 10.0.0.* -t 100

ping.py

from optparse import OptionParser
from threading import Thread
import subprocess
from Queue import Queue


def pinger(q):
    while True:
        _ip = q.get()
        ret = subprocess.call("timeout 1 ping -c 1 %s >/dev/null && echo $_;" % _ip,
                              shell=True,
                              stdout=open('/dev/null', 'w'),
                              stderr=subprocess.STDOUT)
        if ret == 0:
            print "%s: is alive" % _ip
        q.task_done()


if __name__ == "__main__":
    parser = OptionParser()
    parser.add_option("-i", "--ips")
    parser.add_option("-t", "--thread")
    (options, args) = parser.parse_args()
    num_threads = int(options.thread)
    queue = Queue()
    for i in range(num_threads):
        worker = Thread(target=pinger, args=(queue,))
        worker.setDaemon(True)
        worker.start()
    range_ips = options.ips.replace("*", "%s")
    for ip in range(1, 255):
        queue.put(range_ips % ip)
    queue.join()