Get ip block from several ip address

gistfile1.py

from functools import reduce
from math import log, ceil
def x(ip):
    ip_set = ip.split(".")
    int_ip = sum([int(ip_set[-i]) << (i - 1) * 8 for i in xrange(1, 5)])
    
    return int_ip
    
def r_x(int_ip):
    return "%d.%d.%d.%d" % ((int_ip & 0xFF000000) >> 24,
                            (int_ip & 0x00FF0000) >> 16,
                            (int_ip & 0x0000FF00) >> 8,
                            int_ip & 0x000000FF)
    

def get_result(l):
    int_ip_set = map(x, l)
    mask = reduce(lambda x, y: x ^ y, int_ip_set)
    mask = int(ceil(log(mask, 2)))

    print "%s/%d" % (r_x(x(l[0]) & (2 ** 32 - 1) << mask), (32 - mask))
    
input = ['104.223.130.170', '104.223.134.229']
input2 = ['104.127.92.146', '104.127.92.246',
          '104.127.93.119', '104.127.94.204']
get_result(input)
get_result(input2)