This sample show How to get ip address by use net class.
    Private Function IPAddresses(ByVal server As String) As String
        Dim objArray As New ArrayList
        Dim ip As String = String.Empty
        Try
            
            ' Get server related information.
            Dim heserver As System.Net.IPHostEntry = System.Net.Dns.GetHostEntry(server)
            ' Loop on the AddressList
            Dim curAdd As System.Net.IPAddress
            For Each curAdd In heserver.AddressList
                ip = curAdd.ToString
                Exit For
            Next curAdd
        Catch e As Exception
            Debug.WriteLine("Exception: " + e.ToString())
        End Try
        Return ip
    End Function 'IPAddresses
For this sample you can call that funciton by pass name parameter or url such as
IPAddresses("YourPCName")
IPAddresses("www.hotmail.com")
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System.Net Namespace
The System.Net namespace provides a simple programming interface for many of the protocols used on networks today. The WebRequest and WebResponse classes form the basis of what are called pluggable protocols, an implementation of network services that enables you to develop applications that use Internet resources without worrying about the specific details of the individual protocols.
more detail
thanks....
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