How to judge the region of an IP through C?

Consultation area

• RC1140

How to use C# Judge a certain IP Region ？ So I can make statistics easily .

Answer area

• Jaimes

With the help of a third party API Interface , Refer to the website ：https://ipapi.co/8.8.8.8/country/ , C# The code is as follows ：

using System;
using System.Net;
using System.IO;
using System.Text;


public class Program
{
    public static void Main()
    {

      ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

      HttpWebRequest request   = (HttpWebRequest)WebRequest.Create("https://ipapi.co/8.8.8.8/country/");
      HttpWebResponse response = (HttpWebResponse)request.GetResponse();

      var reader = new System.IO.StreamReader(response.GetResponseStream(), ASCIIEncoding.ASCII);
      Console.WriteLine(reader.ReadToEnd());

    }
}

• Vlam

There is an offline IP Regional Library , It can realize complete offline query , Download link ：https://lite.ip2location.com/database/ip-country

1. Create a table and import

CREATE DATABASE ip2location
GO

USE ip2location
GO

CREATE TABLE [ip2location].[dbo].[ip2location_db1](
    [ip_from] float NOT NULL,
    [ip_to] float NOT NULL,
    [country_code] nvarchar(2) NOT NULL,
    [country_name] nvarchar(64) NOT NULL,
) ON [PRIMARY]
GO

CREATE INDEX [ip_from] ON [ip2location].[dbo].[ip2location_db1]([ip_from]) ON [PRIMARY]
GO

CREATE INDEX [ip_to] ON [ip2location].[dbo].[ip2location_db1]([ip_to]) ON [PRIMARY]
GO

BULK INSERT [ip2location].[dbo].[ip2location_db1]
    FROM 'C:\[path to your CSV file]\IP2LOCATION-LITE-DB1.CSV'
    WITH
    (
        FORMATFILE = 'C:\[path to your DB1.FMT file]\DB1.FMT'
    )
GO

1. Code query

We have the database , Next we can use C# The query .

public class Form1 {

    private void Form1_Load(object sender, System.EventArgs e) {
        string ip = "8.8.8.8";
        this.IP2Location(ip);
    }

    private void IP2Location(string myip) {
        IPAddress address = null;
        if (IPAddress.TryParse(myip, address)) {
            byte[] addrBytes = address.GetAddressBytes();
            this.LittleEndian(addrBytes);
            UInt32 ipno = 0;
            ipno = BitConverter.ToUInt32(addrBytes, 0);
            string sql = "SELECT TOP 1 * FROM ip2location_db1 WHERE ip_to >= \'" + ipno.ToString() + "\'";
            object conn = new SqlConnection("Server=yourserver;Database=yourdatabase;User Id=youruserid;Password=yourpassword;");
            object comm = new SqlCommand(sql, conn);
            SqlDataReader reader;
            comm.Connection.Open();
            reader = comm.ExecuteReader(CommandBehavior.CloseConnection);
            int x = 0;
            object sb = new StringBuilder(250);
            if (reader.HasRows) {
                if (reader.Read()) {
                    for (x = 0; (x <= (reader.FieldCount() - 1)); x++) {
                        sb.Append((reader.GetName(x) + (": " + (reader.GetValue(x) + "\r\n"))));
                    }
                }
            }

            reader.Close();
            MsgBox(sb.ToString());
        }

    }

    private void LittleEndian(ref byte[] byteArr) {
        if (BitConverter.IsLittleEndian) {
            List<byte> byteList = new List<byte>(byteArr);
            byteList.Reverse();
            byteArr = byteList.ToArray();
        }

    }
}

Comment area

I didn't expect an offline version IP Address base , This is good , To study the .