I cannot read (less register) in some sites while I search internet (for "whateva") getting:
Sorry. The administrator has banned your IP address. To contact the administrator click here
and when clicking: "here", I see:
You are not logged in or you do not have permission to access this page. This could be due to one of several reasons:

1. You are not logged in. Fill in the form at the bottom of this page and try again.
2. You may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
3. If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation.
The administrator may have required you to register (removed link) before you can view this page.

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Password:
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Funny that they are viewable through anonymizers

I noticed that this happens only in sites with forums on vBulletin.

So, the questions:
What is antispam filters used (by default or most frequently) by vBulletin and how to contest my presence in their blacklists?

BTW, I can understand when register is banned by IP or seeing enclosed references but what the point of closing a site from reading?