java/net/InetAddress/IPv4Formats.java uses the name 'hello' to test for InetAddress.getByName() throwing UnknownHostException. Not a very good name for such a test as it is possible to have a machine named 'hello' on a network. It should use a fully qualified name with a non existing domain which is basically the only way to be fairly certain it will never exist on any of the machines the test is run on.