Python 3: create a list of possible ip addresses from a CIDR notation

Question

I have been handed the task of creating a function in python (3.1) that will take a CIDR notation and return the list of possible ip addresses. I have looked around python.org and found this: http://docs.python.org/dev/py3k/library/ipaddr.html

but i haven't seen anything that will fill this need... I would be very grateful for any assistance anyone cares to kick my way. thanks in advance. :-)

Answer 1

In Python 3 as simple as

>>> import ipaddress >>> [str(ip) for ip in ipaddress.IPv4Network('192.0.2.0/28')] ['192.0.2.0', '192.0.2.1', '192.0.2.2', '192.0.2.3', '192.0.2.4', '192.0.2.5', '192.0.2.6', '192.0.2.7', '192.0.2.8', '192.0.2.9', '192.0.2.10', '192.0.2.11', '192.0.2.12', '192.0.2.13', '192.0.2.14', '192.0.2.15'] 

Answer 2

If you aren't married to using the built-in module, there is a project called netaddr that is the best module I have used for working with IP networks.

Have a look at the IP Tutorial which illustrates how easy it is working with networks and discerning their IPs. Simple example:

>>> from netaddr import IPNetwork >>> for ip in IPNetwork('192.0.2.0/23'): ...    print '%s' % ip ... 192.0.2.0 192.0.2.1 192.0.2.2 192.0.2.3 ... 192.0.3.252 192.0.3.253 192.0.3.254 192.0.3.255