1、新浪IP API：

        新浪这个应该说是最不错的。并且返回的数据类型为可以自定义格式（默认为纯文本格式，根据format的参数定义，还可以返回JS、Json格式。下面列举的是JS的格式）。

        http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js

        返回值数据格式：var remote_ip_info = {"ret":1,"start":"59.37.164.179","end":"59.37.165.17","country":"\u4e2d\u56fd","province":"\u5e7f\u4e1c","city":"\u6c5f\u95e8","district":"","isp":"\u7535\u4fe1","type":"","desc":""};

        http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip=61.135.169.105

        返回值数据格式：var remote_ip_info = {"ret":1,"start":"61.135.164.0","end":"61.135.191.255","country":"\u4e2d\u56fd","province":"\u5317\u4eac","city":"\u5317\u4eac","district":"","isp":"\u8054\u901a","type":"","desc":""}; 

2、淘宝IP API：

http://ip.taobao.com/service/getIpInfo.php?ip=127.0.0.1

直接在URL里传递IP数据，即可获取JSON格式的返回数据。

{“code”:0,”data”:{“country”:”IANA”,”country_id”:”9999″,”area”:”",”area_id”:”-1″,”region”:”",”region_id”:”-1″,”city”:”",”city_id”:”-1″,”county”:”",”county_id”:”-1″,”isp”:”",”isp_id”:”-1″,”ip”:”127.0.0.1″}}

其中code的值为0代表IP地址解析成功，1代表失败。

3、网易 API：