Hostnames different from the current hostname have been collected by miscellaneous plugins. Nessus has generated a list of hostnames that point to the remote host. Note that these are only the alternate hostnames for vhosts discovered on a web server. Different web servers may be hosted on name-based virtual hosts.
If you want to test them, re-scan using the special vhost syntax, such as : www.example.com[184.108.40.206]