CIDR to IPv4 converter. Thrown together for corelanc0d3r.

cidr_to_ipv4

# CIDR to ipv4
# Written by Moshe Kaplan
def to_long(ip):
    ip = ip.split('.', 4)
    return int(ip[0])*(2**24) + int(ip[1])*(2**16) + int(ip[2])*(2**8) + int(ip[3])

def to_dotted_decimal(long_form):
    octets = []
    for i in range(4):
        octets += [str(long_form % 2**8)]
        long_form = long_form >> 8
    return '.'.join(octets[::-1])
    
def cidr_to_ipv4(cidr):
    # Takes a CIDR address: 192.168.2.0/24 and returns a list of IP's in it
    ip, network_bits = cidr.split('/',1)
    host_bits = 32 - int(network_bits)
    # Simplest approach: Turn it into a long, zero out the host bits and then iterate
    long_form = to_long(ip)
    # zero out the host bits
    start = (long_form >> host_bits) << host_bits
    for i in xrange(2**host_bits):
        yield to_dotted_decimal(start | i)
        
for ip in cidr_to_ipv4("192.168.2.0/25"):
    print ip