is the DNS feature capable of blocking selected sites?

Currently i´m using OpenDNS, but it looks that somehow they removed the site blocking feature. If you can confirm both questions, i will reinstall CIS using the DNS thing. So can it block certain sites?

I couldn’t find that option into CIS. Maybe it is that I’m not used to it.
avast (AIS) can block sites by user setting.

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Thanks! Hmm, Avast is not an option atm, i´m using Comodo´s AV now.

If you decide to use the Comodo DNS servers, you won’t have to reinstall CIS to use them. You can use them even if you don’t use CIS:

http://www.comodo.com/secure-dns/index.html