Example of querying IP address through database implemented through IPIP.NET

Last time we introduced how to use the Innocence Database to query IP address details.
However, the Innocence Database is provided by feedback from netizens, and many data descriptions are inaccurate, so I searched for some other IP databases online, and finally found the IP database provided by the website ipip.net.

The database provided by IPIP has two versions: paid and free. We can directly use the free version.
Download address https://www.ipip.net/download.html (you need to register an account first)
There is a PHP parsing class in the compressed package, and there is also a 17monipdb.dat The file is the database, we just need to use it.

Copy 17monipdb.dat to the main directory of the program and use the following code:

Imports System.IO
Imports System.Text

Public Class IPIP

    Shared offset As Integer
    Shared index As UInteger() = New UInteger(255) {}
    Shared dataBuffer As Byte()
    Shared indexBuffer As Byte()
    Shared lastModifyTime As Long = 0L
    Shared ipFile As String

    Shared rwlock As New Threading.ReaderWriterLock


    Shared Sub New()
        Load("17monipdb.dat")
    End Sub

    Shared Sub Load(ByVal filename As String)
        ipFile = New FileInfo(filename).FullName
        Load()
    End Sub

    Shared Sub Load()
        rwlock.AcquireWriterLock(-1)

        Dim fi As New FileInfo(ipFile)
        lastModifyTime = fi.LastWriteTime.Ticks

        Try
            dataBuffer = File.ReadAllBytes(fi.FullName)

            Dim indexLength = BytesToLong(dataBuffer(0), dataBuffer(1), dataBuffer(2), dataBuffer(3))
            indexBuffer = New Byte(indexLength - 1) {}
            Array.Copy(dataBuffer, 4, indexBuffer, 0, indexLength)
            offset = CType(indexLength, Integer)
            
            For lp As Integer = 0 To 255

                index(lp) = BytesToLong( _
                 indexBuffer(lp * 4 + 3), _
                 indexBuffer(lp * 4 + 2), _
                 indexBuffer(lp * 4 + 1), _
                 indexBuffer(lp * 4) _
                 )

            Next

        Catch ex As Exception
            Throw ex
        End Try

        rwlock.ReleaseWriterLock()
    End Sub




    Private Shared Function BytesToLong(ByVal a As Byte, ByVal b As Byte, ByVal c As Byte, ByVal d As Byte) As UInteger
        Return (CType(a, UInteger) << 24) Or (CType(b, UInteger) << 16) Or (CType(c, UInteger) << 8) Or d
    End Function


    Shared Function Find(ByVal ip As String) As String()
        rwlock.AcquireReaderLock(-1)

        Dim ips = ip.Split(".")
        Dim ip_prefix_value = Integer.Parse(ips(0))
        Dim ip2long_value As Long = BytesToLong(Byte.Parse(ips(0)), Byte.Parse(ips(1)), Byte.Parse(ips(2)), Byte.Parse(ips(3)))
        Dim start = index(ip_prefix_value)
        Dim max_comp_len = offset - 1028

        Dim index_offset As Long = -1L
        Dim index_length As Integer = -1
        Dim b As Byte = 0

        start = start * 8 + 1024
        While start < max_comp_len
            If BytesToLong(indexBuffer(start + 0), indexBuffer(start + 1), indexBuffer(start + 2), indexBuffer(start + 3)) >= ip2long_value Then
                index_offset = BytesToLong(b, indexBuffer(start + 6), indexBuffer(start + 5), indexBuffer(start + 4))
                index_length = &HFF And indexBuffer(start + 7)
                Exit While
            End If
            start += 8
        End While

        Dim areaBytes = New Byte(index_length - 1) {}
        Array.Copy(dataBuffer, offset + index_offset - 1024, areaBytes, 0, index_length)

        Dim ret As String() = Encoding.UTF8.GetString(areaBytes).Split(vbTab)

        rwlock.ReleaseReaderLock()

        Return ret
    End Function
    
End Class

This code was translated from the official C# version and some redundant codes were removed , leaving only the core functionality.
It has not been fully tested. Please report any bugs to me.

The method of use is very simple:

Dim ret = IPIP.Find("127.0.0.1"
' 用换行分隔所有信息
Dim ipdesc = String.Join(vbCrLf, ret)

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