Console Port Scanner | Visual Basic.Net Snippet


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Visual Basic.Net

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Console Port Scanner

Viewed: 1167

Version: Framework 2.0

The following code snippet is a simple console port scanner, which can scan a given host using a range of ports.

Import/Using Directives

Imports System.Net.Sockets

Module Module1

    Sub Main()
        Dim tcp As New TcpClient
        Console.WriteLine("Enter Host Name")
        Dim txtHost = Console.ReadLine()
        Console.WriteLine("Enter Start Port")
        Dim txtPortStart = Console.ReadLine()
        Console.WriteLine("Enter Stop Port")
        Dim txtPortStop = Console.ReadLine()

        Dim startPort As Integer = Convert.ToInt32(txtPortStart)
        Dim stopPort As Integer = Convert.ToInt32(txtPortStop)

        Dim port As Integer

        For port = startPort To stopPort
            Try
                tcp.Connect(txtHost, port)

                If (tcp.Connected) Then
                    Console.WriteLine(port & " : Port Open")
                End If

            Catch e As Exception
                Console.WriteLine(port & " : Port Closed")
            End Try
        Next
        tcp.Close()
        Console.WriteLine("Scan Finished")
        Console.ReadKey()
    End Sub

End Module

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