from netaddr import IPNetwork, IPSet

def ip_rev(orig, rev, net):
    if orig.isdisjoint(IPSet(net)):
        rev.add(net)
        return
    elif orig.issuperset(IPSet(net)):
        return
    else:
        for net in net.subnet(net.prefixlen + 1):
            ip_rev(orig, rev, net)

def ip_net_rev(addresses, version=None):
    orig = IPSet(addresses)
    rev = IPSet()
    if version in [None, 4]:
        ip_rev(orig, rev, IPNetwork('0.0.0.0/0'))
    if version in [None, 6]:
        ip_rev(orig, rev, IPNetwork('::/0'))
    return [str(net) for net in rev.iter_cidrs()]

class FilterModule(object):
    def filters(self):
        return {'ip_net_rev': ip_net_rev}

if __name__ == '__main__':
    import sys
    for ip in ip_net_rev(sys.argv[1:]):
        print(ip)