At home I have a small LAN with www (web server), mother (desktop) and pvr (Personal video recorder). Internally, pvr.mydomain.com takes me to the PVR, but I think on the web you need to edit your DNS settings. As SJ says, I think this is down to your hosts. I am with one and one and you can choose to use their DNS settings or do your own. Setting up your own DNS server is not for the faint hearted! Is it a rented server or your own?