项目中有这样的需求,通过IP地址判断客户端是网通的还是电信的。从同事那拿了个纯文本的IP纯真数据库,用Python写了一个小程序,感觉挺好的。下面给出实现源码:
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#!/usr/bin/env python # -*- 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' ) |