How to Retrieve IP Geolocation in Java and PHP Using $_SERVER and ip2region

Recently many Chinese platforms (Weibo, Toutiao, Tencent, Douyin, Zhihu, Kuaishou, Xiaohongshu, etc.) have started displaying a user's IP location—country for overseas users and province for domestic users—without an option to disable it.

On the server side you can retrieve the client IP using the PHP superglobal $ip = $_SERVER["REMOTE_ADDR"]; and output it with echo $ip; . This obtains the raw IP address from the request headers.

For IP‑to‑location mapping, the Taobao IP library (https://ip.taobao.com/) is a common choice, providing province and city information for Chinese IPs.

The open‑source project ip2region (https://github.com/lionsoul2014/ip2region) offers an offline IP location database with up to 99.9% accuracy by aggregating data from several providers (Taobao, GeoIP, CZ88). It supports multiple language bindings, including Java, C#, PHP, C, Python, Node.js, Golang, Rust, Lua, and Nginx.

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ip2region v2.0 introduces a standardized region format (country|area|province|city|ISP), automatic data deduplication and compression (the full database is about 11 MiB), and microsecond‑level query latency. Performance can be further improved with a 512 KiB vector index cache or by loading the entire XDB file into memory.

To use ip2region in a Laravel project, install the package via Composer: composer require larva/laravel-ip2region . Then query an IP address with:

$info = \Larva\Ip2Region\Ip2Region::find('218.1.2.3');
var_export($info, true);
// array (
//     'city_id' => 2163,
//     'region'  => '中国|华南|广东省|深圳市|鹏博士',
// )

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