Why do I see an advertisement when I type my IP address?
That is a page on our server. You share the IP address with other accounts; you will need a dedicated IP address to have your own page show.
Why do I see an advertisement when I type mail.mydomain.com?
This is a mail server address, and the page that shows is on our mail server. This name is never intended to be typed into a browser. There is nothing you can do with this address. It is a reserved name and is not for http use. You share the mail servers with other accounts; you will need a Dedicated to have your own mail server.
Why do I see an advertisement when I type ns1.mydomain.com?
This is a name server address, and the page that shows is on our server. You share the name servers with other accounts, even if you use private nameservers. You will need a Dedicated to have your own server pages.