If you've bought hosting which allows you to host more than one site on it, can others tell if they're linked (other than through the IP)? Eg. I've bought hosting for site mysite.com. I've then included 3 add-on domains. When you install an add on domain in wordpress it asks if you want to install either as myaddondomain.mysite.com or myaddondomain.com. I've installed as myaddondomain.com. Is there any way, other than through the IP to tell if they're connected? The reason I ask is because one day myaddondomain.com was down and the error message on the screen had lots of words but did include "myaddondomain.mysite.com" which would indicate that they're linked. Is there some way of pinging the site or something like that which shows the root directory or something like that to give away that they're on the same account?