通过IP地址判断客户端是网通的还是电信的。
使用一个纯文本的 IP纯真数据库，用Python写了一个小程序。

核心代码：

#!/usr/bin/env python
#site www.jbxue.com
# 
# -*- coding: utf-8 -*- 

from bisect import bisect 

_LIST1, _LIST2 = [], [] 
_INIT = False 

ip2int = lambda ip_str: reduce(lambda a, b: (a << 8) + b, [int(i) for i in ip_str.split('.')]) 

def _init(): 
global _LIST, _INIT 
if not _INIT: 
for l in open('ipdata.txt', 'rb'): 
ip1, ip2 = l.split()[:2] 
addr = ' '.join(l.split()[2:]) 
ip1, ip2 = ip2int(ip1), ip2int(ip2) 
_LIST1.append(ip1) 
_LIST2.append((ip1, ip2, addr)) 
_INIT = True 


def ip_from(ip): 
_init() 
i = ip2int(ip) 
idx = bisect(_LIST1, i) 
assert(idx > 0) 
if len(_LIST1) <= idx: 
return u'unknown ip address %s' % ip 
else: 
frm, to ,addr = _LIST2[idx - 1] 
if frm <= i <= to: 
return addr 
else: 
return u'unknown ip address %s' % ip 


if __name__ == '__main__': 
print ip_from('115.238.54.106') 
print ip_from('220.181.29.160') 
print ip_from('115.238.54.107') 
print ip_from('8.8.8.8')