在flutter中如何从IP地址里获取到国家的countryCode？

Question

需求是根据ip地址转国家码。

Answer 1

我拿本地 Emule 电骡的 IP 库，转成 SQLite 数据库，在浏览器端查了查：

这个 IP 库是个 csv 文件，5.77 MB，gzip 后 0.99 MB，zstd 后 632 KB
转成 SQLite 数据库后，1.83 MB，gzip 后 598 KB，zstd 后 369 KB

csv 文件预览：

"0","16777215","ZZ","ZZZ","Reserved"
"16777216","16777471","AU","AUS","澳大利亚"
"16777472","16777727","CN","CHN","中国"
"16777728","16778239","CN","CHN","中国"
"16778240","16779263","AU","AUS","澳大利亚"
"16779264","16781311","CN","CHN","中国"

估计有点旧了，可以在 https://github.com/emulefansc... 拿到更新