CODEWITHSUNDEEP
javaip
Dan
Dan

Reputation: 2098

IP to host name

I am trying to write code that will return me a domain name if I give it a IP address. Here is what I have done so far;

String destination = "173.194.24.144";
InetAddress address = InetAddress.getByName(destination);
String resolvedHost = address.getHostName();
System.out.println("Translated " + destination + " to host name " + resolvedHost);

What i get is Translated 173.194.24.144 to host name 173.194.24.144

I know for a fact that 173.194.24.144 is an IP address for Google. But with just getting this I tried a little experiment and do a somewhat reverse engineering on the situation. I tried this;

InetAddress addr = InetAddress.getByName("www.google.com");
System.out.println("Host Name " + addr.getHostName());
System.out.println("Host Address " + addr.getHostAddress());

System.out.println("--------------------------------------------");

byte [] add = new byte[]{74, 125, 24, (byte) 105};
InetAddress ip = InetAddress.getByAddress(add);
System.out.println("Host Name " + ip.getHostName());
System.out.println("Host Address " + ip.getHostAddress());

The IP I get in the response is used in the byte array, but the full result I get is;

Host Name www.google.com
Host Address 74.125.24.105
--------------------------------------------
Host Name de-in-f103.1e100.net
Host Address 74.125.24.105

But that just made me more confused as I have got de-in-f103.1e100.net instead of www.google.com

Can anyone shed any light on this for me?

Upvotes: 2

Views: 124

Answers (2)

Dan
Dan

Reputation: 2098

Upon reading and doing more investigating I was finally able to answer the question. If I add the IP address and domain name to the /etc/hosts file and run the class again, it will produce the domain name I inserted into the /etc/hosts file, instead of the original response.

Upvotes: 0

Anubian Noob
Anubian Noob

Reputation: 13596

de-in-f103.1e100.net redirects to Google.

I'm guessing that 74.125.24.105 actually leads to de-in-f103.1e100.net, which then redirects to Google. In the first one, you created an InetAddress pointing to google.com with the same ip. You could get to google by tracing the redirects (tracert on windows command line).

Upvotes: 1

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