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<%@ Page Language="c#" Debug="true" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.Net" %>
<html>
<title>Performing a Reverse-DNS Lookup </title>
<head>
<script language="c#" runat="server">
void BtnCheck_Click(Object sender,EventArgs e) {
try
{
LblHostName.Text = "";
IPAddress myIP = IPAddress.Parse(TxtInput.Text);
IPHostEntry GetIPHost = Dns.GetHostByAddress(myIP);
LblHostName.Text = "Host Name is: " + GetIPHost.HostName;
}catch(Exception ex){
LblHostName.Text = "<font color=red>Error:" + ex.Message;
}
}
</script>
</head>
<body>
<h3><font face="Verdana"> Domain name for a particular IP address using a revere DNS
lookup.</font></h3>
<form runat="server">
Please enter IP address for a fully qualified domain name:
<asp:TextBox id="TxtInput" runat="server" value="207.206.200.200" /><br />
<asp:Button id="BtnCheck" Text="Click Me" onclick="BtnCheck_Click" runat="server" /><br />
<br />
<asp:Label id="LblHostName" runat="server" />
</form>
</body>
</html>
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