A bit more info for you:

If you type the IP into internet Explorer [or any other web browser] you'll get it connecting to port 80 [http] and if a web server exists at that IP address it will serve the web pages, provided it is set to allow anonymous access [nearly all http servers are!]

If you type it in to IE and then put a :21 after it

e.g. 215.136.10.5:21

It will attempt to connect to an FTP server, if it has anonymous access, you will get a directory listing much like in Windows explorer / 'My Computer'.

Connecting to other ports will most likely require specialised programs, but you could try :8080 in Internet Explorer, its an alternative http port that is fairly common if 80 is [a] already used, or [b] not available.

A port scan should tell you more about what ports are open, and if 135 and 139 are open then you can be pretty sure its a Windows box with file & printer sharing enabled... I can't remember details on how to get that IP into your local network so you can browse the contents just like it was in your local LAN, but when I find them I'll post 'em here. I have too many documents and books about security!!!