获取IP地址信息的免费API——ipstack

ipstack为地理位置API提供强大的实时IP，能够查找准确的位置数据并评估源自高风险IP地址的安全威胁。结果以毫秒为单位以JSON或XML格式提供。使用ipstack API，您将能够第一眼就找到网站访问者，并相应地调整您的用户体验和应用程序。

1、 注册获取免费的API访问密钥

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2、 API访问密钥

• API地址： http://api.ipstack.com/
• 请求格式： http://api.ipstack.com/**134.201.250.155**?access_key=**YOUR_ACCESS_KEY**
• 请求响应：

    {
        "ip": "134.201.250.155",
        "type": "ipv4",
        "continent_code": "NA",
        "continent_name": "North America",
        "country_code": "US",
        "country_name": "United States",
        "region_code": "CA",
        "region_name": "California",
        "city": "Huntington Beach",
        "zip": "92648",
        "latitude": 33.6746,
        "longitude": -118.0086,
        "location": {
            "geoname_id": 5358705,
            "capital": "Washington D.C.",
            "languages": [
                {
                "code": "en",
                "name": "English",
                "native": "English"
                }
            ],
            "country_flag": "http://assets.ipstack.com/flags/us.svg",
            ...
            "calling_code": "1",
            "is_eu": false

3、 JSONP Callbacks

• 请求格式： http://api.ipstack.com/**134.201.250.155**?access_key=**YOUR_ACCESS_KEY**&callback=**Your_Function**
• 请求响应：

myfunction(
    {
    "ip": "134.201.250.155",
    "type": "ipv4",
    "continent_code": "NA",
    "continent_name": "North America",
    "country_code": "US",
    "country_name": "United States",
    "region_code": "CA",
    "region_name": "California",
    "city": "Huntington Beach",
    "zip": "92648",
    "latitude": 33.6746,
    "longitude": -118.0086,
    "location": {
        "geoname_id": 5358705,
        "capital": "Washington D.C.",
        "languages": [
            {
            "code": "en",
            "name": "English",
            "native": "English"
            }
        ],
        "country_flag": "http://assets.ipstack.com/flags/us.svg",
        ...
        "calling_code": "1",
        "is_eu": false
        }
    }
)

4、错误代码

5、 示例代码

• PHP (cURL)

// set IP address and API access key 
$ip = '134.201.250.155';
$access_key = 'YOUR_ACCESS_KEY';
// Initialize CURL:
$ch = curl_init('http://api.ipstack.com/'.$ip.'?access_key='.$access_key.'');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
// Store the data:
$json = curl_exec($ch);
curl_close($ch);
// Decode JSON response:
$api_result = json_decode($json, true);
// Output the "capital" object inside "location"
echo $api_result['location']['capital'];

• JavaScript (jQuery.ajax)

// set endpoint and your access key
var ip = '134.201.250.155'
var access_key = 'YOUR_ACCESS_KEY';
// get the API result via jQuery.ajax
$.ajax({
    url: 'http://api.ipstack.com/' + ip + '?access_key=' + access_key,   
    dataType: 'jsonp',
    success: function(json) {
        // output the "capital" object inside "location"
        alert(json.location.capital);
    }
});

更多详细内容，请查看官方文档：