>> could navigate to this page only...
http://193.113.211.125/digitaldemo/DNS is what converts human readable webpages into computer readable format.
For our browsers to be able to fetch a page it needs to be converted into the IP address and its the job of a DNS server to do the translation. eg
www.kitz.co.uk to 195.62.28.175.
DNS is normally allocated by default by our routers and is set to use our
ISP DNS Servers although they can be manually set to which ever ones you like.
However when you log onto say the BT domain - because its a restricted domain, your normal (ISP) DNS server cant be contacted to send back the conversion from human to computer readable format and why we have to use the IP address.
The fact that you couldn't navigate to that page using the web address but could using the IP address indicates that yes youre on IPStream and the only reason why you couldnt view the page previously was because your (AOL?) DNS server couldnt be contacted to fetch a result.
The above is a simplified version but hope it makes sense.