Enumerate IPS

ips.py

#!/usr/bin/env python
import sys
(ip, mask) = sys.argv[1].split('/')
mask = int(mask)
def parseip(addr):
    (a,b,c,d) = addr.split('.')
    return int(d)*(256**0) + int(c)*(256**1) + int(b)*(256**2) + int(a)*(256**3)

def printip(numeric_ip):
    d = numeric_ip&0xFF
    c = (numeric_ip&0xFF00)>>8
    b = (numeric_ip&0xFF0000)>>16
    a = (numeric_ip&0xFF000000)>>24
    return "%d.%d.%d.%d" % (a, b, c, d)

parsed_ip = parseip(ip)
for i in range(0, 2**mask):
    print printip(parsed_ip+i)