한국인터넷진흥원에서 한국IP대역 뽑아내기

#!/usr/bin/python25
 
from csv import reader
import iplib
 
FILE="KR_IPv4_data(20070803).cvs"
 
RANGE =  map(lambda x : pow(2,x) , range(20))
def get_range(i):
        return RANGE.index(  max( [ x for x in RANGE if x <= i ] ) )
 
def cal_subnets(f,l,r):
        back = [f,l,r]
        f = iplib.IPv4Address(f)
        l = iplib.IPv4Address(l) + 1
        diff =  map(int,str(l - f).split("."))
        c = 0
        for p in [3,2,1,0]:
                if diff[p] != 0:
                        break
        if diff[p] in RANGE:
                i = RANGE.index( diff[p])
        else:
                i = get_range(diff[p])
        cidr = 8 * p + ( 8 -  i)
        CIDR = "%s/%s" % ( str(f) , str(cidr))
        if str(l-1) != (iplib.CIDR(CIDR).get_last_ip() + 1):
                # recursive call
                print "%s - %s %s -> %s" % ( back[0] , back[1] , CIDR , (iplib.CIDR(CIDR).get_last_ip() + 1) )
                fromip = iplib.CIDR(CIDR).get_last_ip() + 2
                toip = back[1]
                cal_subnets(str(fromip),toip,0)
                #print "RECURSIVE END"
        else:
                print "%s - %s %s -> %s  " % (back[0] , back[1] , CIDR , (iplib.CIDR(CIDR).get_last_ip() + 1) )
 
 
for c in reader(open(FILE)):
        if len(c) == 4 and c[3].endswith('.'):
                firstip = c[0]
                lastip = c[1]
                iprange = int(c[2].replace(",",""))
                cal_subnets(firstip,lastip,iprange)