http://stackoverflow.com/questions/8635073/python-itertools-combinations-results

iprange.py

"""
Turn things like 10.[3-25].0.X into list of IPs.
"""

import re
import sys
import itertools

def octet(s):
    """
    Takes a string which represents a single octet.
    Returns a list of values.
    """
    if s == 'X':
        return xrange(256)
    try:
        low, high = [int(val) for val in s.strip('[]').split('-')]
        if low > high or low < 0 or high > 255:
            raise RuntimeError('That is no valid range.')
        return xrange(low, high + 1)
    except ValueError as err:
        number = int(s)
        if not 0 <= number <= 255:
            raise ValueError('Only 0-255 allowed.')
        return [number]

if __name__ == '__main__':
    try:
        template = sys.argv[1]
        octets = [octet(s) for s in template.split('.')]
        # print(octets)
        for parts in itertools.product(*octets):
            print('.'.join(map(str, parts)))
    except IndexError as err:
        print('Usage: %s IP-TEMPLATE' % (sys.argv[0]))
        sys.exit(1)