这个IP库实测还是比较准确的,免费版的可以具体到国内城市，国外只能到国家名称,免费版的自己定期更新Ip数据库即可。

以下为C#调用代码

class Program{static void Main(string[] args){try{//传入要查询的ip 和17monipdb.datx 下载的ip库所在位置string address = IPAddress.FindIPAddress("1.198.219.205", @"D:\开发资料\资料\Code\IP地址获取\IPAddress\IPAddress\bin\Debug"); Console.WriteLine(address);}catch (IOException ioex){Console.WriteLine(ioex.StackTrace);}catch (IPv4FormatException ipex){Console.WriteLine(ipex.StackTrace);}Console.ReadKey(true);}}public class IPAddress{public static string FindIPAddress(string ip,string basePath){string address = "";if (string.IsNullOrEmpty(ip)){return address;}try{string path = string.Format("{0}\\{1}", basePath, "17monipdb.datx");City city = new City(path);string[] arr = city.find(ip);if (arr != null && arr.Length > 0){address = string.Join("-", arr);}}catch (IOException ioex){Console.WriteLine(ioex.StackTrace);}catch (IPv4FormatException ipex){Console.WriteLine(ipex.StackTrace);}return address.TrimEnd("-".ToCharArray());}}

IPIP.net官网在这

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