Once in a while you may need to block specific third parties from accessing your Internet sites. There are a lot of automatic bots which crawl the Internet, for example, and generate fake visits and traffic. In addition, there are spammers who leave links to shady websites as comments to site articles. This kind of things could greatly undermine your projects, as no one likes to visit a site with many hundreds of fake comments, not to mention that the increased traffic from both spammers and bots may create high load on the web server where your website is hosted, which may result in the site not working properly. One of the best solutions in such a case is to block the IPs which create the fake traffic, as a way to make certain that the visits to your site are real.