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copied!<p>After reading the comments, bobince is definitely right and these 2 should be used in tandem with each other. For best results you should use the reverse DNS lookup here as well as to use the passive DNS replication.</p> <pre><code>string IpAddressString = "208.5.42.49"; //eggheadcafe try { IPAddress hostIPAddress = IPAddress.Parse(IpAddressString); IPHostEntry hostInfo = Dns.GetHostByAddress(hostIPAddress); // Get the IP address list that resolves to the host names contained in // the Alias property. IPAddress[] address = hostInfo.AddressList; // Get the alias names of the addresses in the IP address list. String[] alias = hostInfo.Aliases; Console.WriteLine("Host name : " + hostInfo.HostName); Console.WriteLine("\nAliases :"); for(int index=0; index < alias.Length; index++) { Console.WriteLine(alias[index]); } Console.WriteLine("\nIP address list : "); for(int index=0; index < address.Length; index++) { Console.WriteLine(address[index]); } } catch(SocketException e) { Console.WriteLine("SocketException caught!!!"); Console.WriteLine("Source : " + e.Source); Console.WriteLine("Message : " + e.Message); } catch(FormatException e) { Console.WriteLine("FormatException caught!!!"); Console.WriteLine("Source : " + e.Source); Console.WriteLine("Message : " + e.Message); } catch(ArgumentNullException e) { Console.WriteLine("ArgumentNullException caught!!!"); Console.WriteLine("Source : " + e.Source); Console.WriteLine("Message : " + e.Message); } catch(Exception e) { Console.WriteLine("Exception caught!!!"); Console.WriteLine("Source : " + e.Source); Console.WriteLine("Message : " + e.Message); } </code></pre> <p>courtesy of <a href="http://www.eggheadcafe.com/community/aspnet/2/83624/system-dns-gethostbyaddre.aspx" rel="noreferrer">http://www.eggheadcafe.com/community/aspnet/2/83624/system-dns-gethostbyaddre.aspx</a></p>

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