UDDI inquiry access point?

See more:

VB

webservice

WSDL

Using VS2015, I'm trying to send an find_business inquiry to UDDI.
I've referenced

uddi_api_v3_binding.wsdl

as webreference UDDI (UDDI_API_Inquiry.UDDI).

However when running, the InvalidOperationException shows:

Path property must be set before calling the Send method.

Somehow it still needs the WS.URL, but what is the exact UDDI Inquiry URL (webservice accesspoint)? And why is it not implemented in the WSDL as usual?

What I have tried:

Imports UDDI_API_Inquiry

Public Class Form1

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        Dim WS As New UDDI.UDDI_Inquiry_SoapBinding
        WS.Url = " -- UDDI Inquiry URL -- "

        Dim fb As New UDDI.find_business

        Dim bName As UDDI.name = New UDDI.name
        bName.Value = "siemens"

        fb.name = New UDDI.name() {bName}

        Dim bl As New UDDI.businessList
        bl = WS.find_business(fb)

        For i As Integer = 0 To bl.businessInfos.Length - 1
            Console.WriteLine(bl.businessInfos(i).name(0).Value)
        Next

    End Sub

End Class