Question

There is a website which you can query with a domain and it will return a list of all the websites hosted on that IP. I remember there being a method in C# that was something like ReturnAddresses or something of that sort. Does anyone have any idea how this is done? Quering a hostname or IP and having returned a list of hostnames aka other websites hosted on the same server?

the website is: http://www.yougetsignal.com/tools/web-sites-on-web-server/

Answer 1

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.

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); } 

courtesy of http://www.eggheadcafe.com/community/aspnet/2/83624/system-dns-gethostbyaddre.aspx