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copied!<p>I've just made some experiments with <code>InetAddress</code> class and also read its javadocs.</p> <p>After the first touch I can tell that I get <code>UnknownHostException</code> in 2 cases: either when I pass illegal formated string (like <code>http://stackoverflow.com</code> instead of <code>stackoverflow.com</code>) or when I pass URL that cannot be resolved in browser too (i.e. something like <code>aosjdfk23423.com</code>).</p> <p>Both cases are documented in javadocs (although it's not explicitely said anywhere anything strict about the parameter format). Here are related javadocs parts:</p> <blockquote> <p>The host name can either be a machine name, such as <code>java.sun.com</code>, or a textual representation of its IP address. If a literal IP address is supplied, only the validity of the address format is checked.</p> </blockquote> <p><p></p> <blockquote> <p>@exception UnknownHostException if no IP address for the <code>host</code> could be found, or if a scope_id was specified for a global IPv6 address.</p> </blockquote> <p>Summary:</p> <p>this works:</p> <pre><code>InetAddress.getByName("google.com"); InetAddress.getByName("74.125.87.99"); </code></pre> <p>and this throws <code>UnknownHostException</code>:</p> <pre><code>InetAddress.getByName("http://google.com"); InetAddress.getByName("unexistingresourse234234.com"); </code></pre> <p>UPD (as an answer to the comments: there should be something like this:</p> <pre><code>List<String> hosts = getPossibleHosts(); //these are all hosts you want to transform into inet addresses final List<InetAddress> inetAddresses = new LinkedList<InetAddress>(); final List<String> badHosts = new LinkedList<String>(); for(String host : hosts) { try { inetAddresses.add(InetAddress.getByName(host)); } catch (UnknownHostException e) { badHosts.add(host); } } </code></pre> <p>After that you can process both lists as you wish. But it's a mistake to try to put them in the same list - they are not same. </p>

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