Port scan : Socket Port « Socket Network

Port scan : Socket Port « Socket Network « VB.Net Tutorial

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VB.Net Tutorial » Socket Network » Socket Port

22.8.1.Port scan

Imports System.Net.Sockets

Imports System.Net

Imports System.Threading

Imports System.Text



Public Class Tester

    Public Shared Sub Main

        Dim intPortStart As Integer = 1

        Dim intPortEnd As Integer = 10

        Dim lngLoop As Long



        For lngLoop = intPortStart To intPortEnd

            Dim myTcpClient As New TcpClient()

            Try

                myTcpClient.Connect("127.0.0.1", lngLoop)

                Console.WriteLine("Port " + lngLoop.ToString() + "started")

                myTcpClient.Close()

            Catch ex As SocketException

                Console.WriteLine("Port " + lngLoop.ToString() + " Closed" + ex.Message)

            End Try

        Next

    End Sub



End Class

Port 1 ClosedNo connection could be made because the target machine actively refused it
Port 2 ClosedNo connection could be made because the target machine actively refused it
Port 3 ClosedNo connection could be made because the target machine actively refused it
Port 4 ClosedNo connection could be made because the target machine actively refused it
Port 5 ClosedNo connection could be made because the target machine actively refused it
^CTerminate batch job (Y/N)? n

22.8.Socket Port
	22.8.1.	Port scan

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