或者 使用某网站的API
API 1.
1. 返回文字
Html代码 
- http://api.hostip.info/get_html.php?ip=12.215.42.19&position=true
2. 返回图片
Html代码
- <IMG SRC="http://api.hostip.info/flag.php?ip=12.215.42.19" ALT="IP Address Lookup">
API 2. （需要申请api key ，免费的，类似google）
城市：
Html代码
- http://api.ipinfodb.com/v3/ip-city/?key=<your_api_key>&ip=74.125.45.100
国家（更快） ：
Html代码
- http://api.ipinfodb.com/v3/ip-country/?key=<your_api_key>&ip=74.125.45.100
Parameter Required Default Value
| key | Yes | <empty> | API key provided with your free account. |
| ip | No | Client IP | IP address |
| format | No | raw | raw, xml, json |
| callback | No | <empty> | Required when using json callback. |
Please use the appropriate API for your needs. You can help us keep the load low on our servers by making sure that :
- If you only need the country name, avoid using the city precision API.
- If you track your visitors, avoid querying our API for all your page views (you can store the geolocation in a cookie, see below for an example)
API Precision Timezone Domains lookups
| ip-city | City | Yes | Yes |
| ip-country | Country | No | Yes |
Please use the appropriate API for your needs. You can help us keep the load low on our servers by making sure that :
- If you only need the country name, avoid using the city precision API.
- If you track your visitors, avoid querying our API for all your page views (you can store the geolocation in a cookie, see below for an example)
-
key: c9dcc88453e33a9e63ebad8d65f91583e87abd8185dd95f09fbeef6c62264f7d
其他参考
http://pecl.php.net/package/geoip
http://www.geoiptool.com/
http://www.hostip.info/use.html
http://phpweby.com/software/ip2country
http://www.ipinfodb.com/index.php