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.

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

Answer 3

Have you checked out iptools? It seems to be a fairly good fit.

Answer 4

Generate all Public IP Addresses given a CIDR

https://github.com/stephenlb/geo-ip will generate a list of Valid IP Public Addresses including Localities.

'1.0.0.0/8' to '191.0.0.0/8' are the valid public IP Address range exclusive of the reserved Private IP Addresses.

IP Generator

Generates a JSON dump of IP Addresses and associated Geo information. Note that the valid public IP Address range is from '1.0.0.0/8' to '191.0.0.0/8' excluding the reserved Private IP Address ranges shown lower down in this readme.

docker build -t geo-ip .
docker run -e IPRANGE='54.0.0.0/30' geo-ip               ## a few IPs
docker run -e IPRANGE='54.0.0.0/26' geo-ip               ## a few more IPs
docker run -e IPRANGE='54.0.0.0/16' geo-ip               ## a lot more IPs
docker run -e IPRANGE='0.0.0.0/0'   geo-ip               ## ALL IPs ( slooooowwwwww )
docker run -e IPRANGE='0.0.0.0/0'   geo-ip > geo-ip.json ## ALL IPs saved to JSON File
docker run geo-ip 

A little faster option for scanning all valid public addresses:

for i in $(seq 1 191); do \
    docker run -e IPRANGE="$i.0.0.0/8" geo-ip; \
    sleep 1; \ 
done

This prints less than 4,228,250,625 JSON lines to STDOUT. Here is an example of one of the lines:

{"city": "Palo Alto", "ip": "0.0.0.0", "longitude": -122.1274,
 "continent": "North America", "continent_code": "NA",
 "state": "California", "country": "United States", "latitude": 37.418,
 "iso_code": "US", "state_code": "CA", "aso": "PubNub",
 "asn": "11404", "zip_code": "94107"}

Private and Reserved IP Range

The dockerfile in the repo above will exclude non-usable IP addresses following the guide from the wikipedia article: https://en.wikipedia.org/wiki/Reserved_IP_addresses

MaxMind Geo IP

The dockerfile imports a free public Database provided by https://www.maxmind.com/en/home

Answer 5

It's not in the documentation, but browsing the source suggests that ipaddr implements __iter__ and iterhosts, which is exactly what you want.

---

Err, nevermind.

1. It looks like ipaddr.py was added to stdlib in 3.1 beta, but removed by 3.1 rc.
2. I was looking at the sources from the original ipaddr.py, which seems to have evolved separately from the copy at python.org.

You could just bundle the latter.

Answer 6

Below code will generate range of IPs on providing IP and subnet. Expand the CIDR notation like(255.255.255.0)

from netaddr import *

def getFirstIp(ipAddress,subnet):
  ipBin = IPNetwork(ipAddress).ip.bits().split('.')
  subBin = IPNetwork(subnet).ip.bits().split('.')
  zipped = zip(ipBin,subBin)
  netIdList = []
  for octets in zipped:
    netIdList.append(''.join(str(b) for b in (map((lambda x: int(x[0])*int(x[1])),zip(list(octets[0]),list(octets[1]))))))
  firstIp = ''
  firstIp = '.'.join(str(int(oct,2)) for oct in netIdList)
  return firstIp


def getLastIp(ipAddress,subnet):
  ipBin = IPNetwork(ipAddress).ip.bits().split('.')
  subBin = IPNetwork(subnet).ip.bits().split('.')
  #print ipBin
  #print subBin
  revsubBin = []
  for octets in subBin:
    revB = ''.join('1' if(b == '0') else '0' for b in octets)
    revsubBin.append(revB)
  zipped = zip(ipBin,revsubBin)
  netIdList = []
  for octets in zipped:
    netIdList.append(''.join(str(b) for b in (map((lambda x: 0 if(int(x[0]) == 0 and int(x[1]) == 0) else 1),zip(list(octets[0]),list(octets[1]))))))
  #print netIdList
  lastIp = ''
  lastIp = '.'.join(str(int(oct,2)) for oct in netIdList)
  return lastIp

def getRangeOfIps(firstIp,lastIp):
  start= int(IPAddress(firstIp))
  end = int(IPAddress(lastIp))
  ipList = []
  for ip in range(start,end+1):
    ipList.append(str(IPAddress(ip)))
  return ipList

def manipulateIP():
 firstIp = getFirstIp(ipAddress,subnet)
 lastIp = getLastIp(ipAddress,subnet)
 ipList = getRangeOfIps(firstIp,lastIp)  
 print ipList