How can i make a forum like this? Invite only and nothing is visible to guests?

[Ronald]

I want to make a forum like this
http://www.80630.com/

What forum can do this? I cant find anything for phpbb/vb/invision
I want my forum to be invite only. So i give my invite to one person, they invite others etc...
Unregistered users will only see a login page. even if they type #forumurl.com/forum/register.php
So they cant access anything at all

[Marwan]

http://www.vanillaforums.com/
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http://www.stribe.com/
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http://www.weebly.com/
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http://www.lefora.com/
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http://kafafa.com/
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http://www.lifeyo.com/
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http://www.yola.com/
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http://www.webon.com/
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http://www.devhub.com/
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