https://ipip.yy.com/get_ip_info.php
http://pv.sohu.com/cityjson?ie=utf-8
http://www.ip168.com/json.do?view=myipaddress
http://www.ipip.net/ip.php
http://ip.chemdrug.com/
http://ip.siteloop.net/
http://whois.pconline.com.cn/ipJson.jsp?callback={IP:255.255.255.255}
http://www.whatismyip.com.tw/