Java InetAddress.getHostName() taking a very long time to execute

Question

I have the following little code snippet:

        InetAddress address = InetAddress.getByName(host);
        if(address.isReachable(TIMEOUT_IN_MILLISECONDS))         


        

Answer 1

toString() seems to be faster:

given an InetAddress ia or InterfaceAddress ia,

System.out.println ( ia.toString() ) will show a string containing your ipAddress faster than ia.getHostName()

You can then use ia.toString().substring to extract it.

I don't know why.