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Client Hostname in vb.net

Posted on 2009-07-15
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Last Modified: 2013-11-26
I am trying to determine the hostname of the client accessing the webpage. If the user is coming from a .edu let them see the button. If not, don't let them see the button.  After searching some groups this is what I have, but I can't get it to work.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        
 
 

	Public Function IPToHostName(ByVal IPAddress As String) _

          As String
 

        Dim objEntry As IPHostEntry

        Dim sAns As String

        Try

            objEntry = Resolve(IPAddress)

            sAns = objEntry.HostName

        Catch ex As Exception
 

            sAns = ""

        End Try
 

        Return sAns
 

    End Function
 

	Response.Write (sAns)
 

    End Sub
 

End Class

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Question by:j1haskins
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raterus earned 500 total points
ID: 24859410
Even if you got this working, I don't think you are going to be happy with it.  In order to do this, you'll have to do a reverse lookup on their IP address.  The ISP owns that ip address, and they are going to have to be nice enough to have entered a nice .edu domain there.  There is no guarantee that is done, and I imagine for the most part it isn't setup properly.
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Author Closing Comment

by:j1haskins
ID: 31603647
Thank you for your assistance.
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