If you ever need to get the IP Address of the local computer you need look no further than the System.Net.Dns class. Since a computer can have more than one IP Address you need to iterate throught the collection. Here is a sample that fills a listbox with all the IP addresses from your computer.
Private Sub Form_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Try
' IpHostEntry is a helper class for the Dns class
' Environment.MachineName should return local computername
Dim hostServer As IPHostEntry = Dns.Resolve(Environment.MachineName)
' assume that we only have IPv4 address
' if you are using IPv6 then you can test with ip.AddressFamily
For Each ip As IPAddress In hostServer.AddressList
' Display the server IP address in the standard format.
' IPv4 it will be in dotted-quad notation
' IPv6 it will be in colon-hexadecimal notation.
Me.ListBox1.Items.Add(ip.ToString)
Next
Catch ex As Exception
Console.WriteLine(ex.Message)
End Try
End Sub