[VBA] Ayuda con macro en Excel

Sub ip()
Dim programa As String
Dim Ide As Double
    On Error Resume Next
programa = "cmd.exe"
Ide = Shell("cmd.exe /k ipconfig > hostname.txt", vbNormalFocus)
    If Err <> 0 Then
        MsgBox "No se puede iniciar " & programa, vbCritical, " Error"
    End If

End Sub

Function GetMyPublicIP() As String

    Dim HttpRequest As Object
    
    On Error Resume Next
    'Create the XMLHttpRequest object.
    Set HttpRequest = CreateObject("MSXML2.XMLHTTP")

    'Check if the object was created.
    If Err.Number <> 0 Then
        'Return error message.
        GetMyPublicIP = "Could not create the XMLHttpRequest object!"
        'Release the object and exit.
        Set HttpRequest = Nothing
        Exit Function
    End If
    On Error GoTo 0
    
    'Create the request - no special parameters required.
    HttpRequest.Open "GET", "http://myip.dnsomatic.com", False
    
    'Send the request to the site.
    HttpRequest.Send
        
    'Return the result of the request (the IP string).
    GetMyPublicIP = HttpRequest.ResponseText

End Function