#!/usr/bin/env python
import sys
import gevent
from gevent import socket
found = []
def ip2url(ip):
    try:
        url = socket.gethostbyaddr(ip)
        found.append([ip,url[0]])
    except:
        pass
        
addrs = ['87.250.250.%s' % i for i in range(1,255)]  
for addr in addrs:
    gevent.spawn(ip2url,addr).join(timeout=0.1)
for i in found:print i
sys.exit()

 #!/usr/bin/env python
import sys
import gevent
from gevent import socket
from gevent.pool import Pool
from time import time
def ip2url(ip):
    try:
        url = socket.gethostbyaddr(ip)
        found.append(ip +' : '+ url[0])
    except:
        pass
    
if __name__=="__main__":
    #addrs = ['173.194.222.%s' % i for i in range(1,255)] #google 
    #addrs = ['87.250.250.%s' % i for i in range(1,255)]  #yandex
    #addrs = ['94.100.180.%s' % i for i in range(1,255)] #mail.ru
    addrs = ['81.19.82.%s' % i for i in range(1,255)] #rambler
    pool = Pool(10)
    found = []
    t1 = time()
    with gevent.Timeout(5,False):
        for addr in addrs:
            pool.spawn(ip2url,addr)
        pool.join()
    t2 = time()
    for i in found: print i
    print 'time:',t2 - t1,'found:',len(found)
    sys.exit()