netaddress-check.py

#!/usr/bin/python
#http://stackoverflow.com/questions/819355/how-can-i-check-if-an-ip-is-in-a-network-in-python
#
# Compares list of ip-addresses (murtautujat.txt) to the list of networks (verkot.txt) and lists ip's and networks which matches.
#
from netaddr import IPNetwork, IPAddress

m=0
n=0
file2 = open("verkot.txt", "r")

while 1:
  m+=1
#  print m
  linen = file2.readline()
  if not linen:
    break
  file = open("murtautujat.txt", "r")
  while 1:
    n+=1
    line = file.readline()
    if not line:
      n=0
      break
    if IPAddress(line) in IPNetwork(linen):
      print line, linen