Add a python script to get cidr from arin

domains.txt

+www.google.com
+www.google.com.hk
+www.google.sg
+www.google.co.jp
+accounts.google.com
+plus.google.com
+play.google.com
+news.google.com
+mail.google.com
+wallet.google.com
+www.gstatic.com
+ssl.gstatic.com
+lh5.googleusercontent.com
+youtube.com
+www.youtube.com
+m.youtube.com
+i.ytimg.com
+s.ytimg.com
+r2---sn-npo7zn7s.googlevideo.com
+tc.v1.cache2.googlevideo.com
+tc.v10.cache1.googlevideo.com
+tc.v10.cache8.googlevideo.com
+manifest.googlevideo.com
+yt3.ggpht.com
+www.blogger.com
+googleblog.blogspot.com
+facebook.com
+www.facebook.com
+developers.facebook.com
+l.facebook.com
+static.xx.fbcdn.net
+scontent-a-sin.xx.fbcdn.net
+scontent-b-sin.xx.fbcdn.net
+fbcdn-profile-a.akamaihd.net
+fbexternal-a.akamaihd.net
+fbcdn-sphotos-d-a.akamaihd.net
+bit.ly
+www.twitter.com
+m.twitter.com
+mobile.twitter.com
+support.twitter.com
+about.twitter.com
+twimg.com
+abs.twimg.com
+pbs.twimg.com
+ma.twimg.com
+t.co
+

route.py

+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import socket
+import xml.etree.ElementTree
+import urllib2
+
+
+def get_netmask(mask):
+    bits = 0
+    for i in xrange(32 - mask, 32):
+        bits |= (1 << i)
+    return "%d.%d.%d.%d" % ((bits & 0xff000000) >> 24, (bits & 0xff0000) >> 16, (bits & 0xff00) >> 8, (bits & 0xff))
+
+
+def get_decimal_ip(ip):
+    ip_split = ip.split('.')
+    ip_decimal = 0
+
+    for i in ip_split:
+        ip_decimal += int(i)
+        ip_decimal <<= 8
+
+    ip_decimal >>= 8
+    return ip_decimal
+
+
+def query_cidr(ip):
+    url = "http://whois.arin.net/rest/nets;q=%s?showDetails=true&showARIN=false&ext=netref2" % ip
+    f = urllib2.urlopen(url)
+    ss = f.read()
+    root = xml.etree.ElementTree.fromstring(ss)
+    net_block = root.find("{http://www.arin.net/whoisrws/core/v1}net").find(
+        "{http://www.arin.net/whoisrws/core/v1}netBlocks").find("{http://www.arin.net/whoisrws/core/v1}netBlock")
+    start_address = net_block.find("{http://www.arin.net/whoisrws/core/v1}startAddress").text
+    cidr_length = int(net_block.find("{http://www.arin.net/whoisrws/core/v1}cidrLength").text)
+    return start_address, get_netmask(cidr_length)
+
+
+if __name__ == "__main__":
+    route_table = {}
+
+    with open("domains.txt", "r") as f:
+        for line in f:
+            domain = line.strip()
+
+            if len(domain) != 0:
+                print("Processing domain [%s] " % domain),
+                ip = socket.gethostbyname(domain)
+                print("IP: %s" % ip),
+                decimal_ip = get_decimal_ip(ip)
+                exist = False
+                for t in route_table:
+                    if (t & decimal_ip) == t:
+                        exist = True
+                        break
+                if exist:
+                    print "exist, skip . . ."
+                else:
+                    addr, mask = query_cidr(ip)
+                    route_table[get_decimal_ip(addr)] = (addr, mask)
+                    print("CIDR: %s/%s" % (addr, mask))
+
+    tables = sorted(route_table.items())
+    print tables
+
+    with open("route.txt", "w") as f:
+        for route in tables:
+            print("route = %s/%s" % (route[1][0], route[1][1]))
+            f.write("route = %s/%s\n" % (route[1][0], route[1][1]))