Public Class Form1
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles MyBase.Load
        Timer1.Interval = 500
        Timer1.Enabled = True
        Timer1.Start()
    End Sub
 
    Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As _
      System.EventArgs) Handles Timer1.Tick
        'Deine IP-Überprüfung
 
        'Und dann deine schon gebastelte Ausgabe
        If lblAusgabeIPAdr.Text = "127.0.0.1" Then
            .BackColor = Color.Red
        Else
            .BackColor = Color.Empty
        End If
    End Sub
 
End Class