Which port to use for this situation?

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VB

UDP

Hi people

I know i've posted something similar to this before, but it's a completely different question.

The problem is, that with the following code, port 54545 does not work. The code is intended to send a message via the port variable to the IP address.
I want the code to be able to, for example, send a message to you, the one reading this, if you have the receiver program (which has to be anywhere in the world, providing you have a network connection)

Imports System.Net
Imports System.Net.Sockets
Imports System.Threading
Imports System.Text
Public Class Form1
    Private Const port As Integer = 54545
    Dim RecipientIPAddress As String = Nothing '255.255.255.255 for local network
    Private sendingClient As UdpClient
    Private Sub SendMsgButton_Click() Handles SendMsgButton.Click
        RecipientIPAddress = IPToSendToTextbox.text 'for example, 192.168.1.99
        InitializeSender()
    End Sub
    Private Sub InitializeSender()
        sendingClient = New UdpClient(RecipientIPAddress, port)
        sendingClient.EnableBroadcast = True
    End Sub
    Public toSend As String
    Dim data() As Byte
    Public Shared Sub go()
        form1.data = Encoding.ASCII.GetBytes(form1.toSend)
        form1.sendingClient.Send(form1.data, form1.data.Length)
    End Sub
   end class

Things I know about the problem:

* UDPClient Ports range from 5454[2-5]
* Port 80 doesn't work

Does anyone know a port number that will work for this?

Thanks.