If you were blocking website access one site at a time, the answer is yes. However, DNS filters enable you to block website access by category (i.e., porn, gambling, dating, chat, etc.) and by IP range. Blocking by IP range makes it quicker to block access to websites such as Facebook that have multiple domains (i.e., fb.com, fbcdn.net, fbsbx.com, etc.), thus reducing the administrative overhead of effective DNS filtering.