📄 dns.aspx
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<%@ Import Namespace="System.Net" %>
<Script runat="Server">
Sub Button_Click( s As Object, e As EventArgs )
Dim objIPHostEntry As IPHostEntry
objIPHostEntry = Dns.GetHostByAddress( txtIP.Text )
lblHostName.Text = objIPHostEntry.HostName
End Sub
</Script>
<html>
<head><title>Dns.aspx</title></head>
<form runat="Server">
<h2>Enter an IP Address:</h2>
<asp:TextBox
id="txtIP"
Runat="Server" />
<asp:Button
Text="Submit!"
OnClick="Button_Click"
Runat="Server" />
<p>
<asp:Label
id="lblHostName"
EnableViewState="False"
Runat="Server" />
</form>
</body>
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