khuynh, you want to find out the ip addresses of adult websites? hmmm.....
Seriously, it is easy to block access to a web url such as
www.bikinbabes.com, less easy to block access to an ip address.
It seems that Billrich thinks you want to find out your own ip address, but I am sure that when he gets around to actually reading your post properly he'll want to tell you to add the urls of the adult websites to your HOSTS file. If you search on Google for "Windows HOSTS file format" you will see lots of information about how to block access to a given web site this way.
However since the HOSTS file can be manipulated by people such as hackers many system admins (and all sensible ones) deny access to ordinary users