virtualbox.org

I run windows xp on both guest and master. I want to be able to launch apache server on guest and access site from master os. But it doesn't work.

Nobody can help you if that is all the information you give. Just saying "it doesn't work" is useless.

Please read the Forum Posting Guide.

But there is nothing else to tell. I enter my ip in browser on master os and I get nothing. But doing the same on guest opens my site.

There is tons of info you can give. Network settings, IP configuration, VM settings; there is so much, I don't even know where to begin.

How did you setup your network? Bridged? NAT? Host Only?