title: blocking semalt referrers with htaccess rules
body: <p>I have implemented the following code to htaccess but are still seeing referrers from semalt, such as:</p>
  
  <pre><code>74.semalt.com
  89.semalt.com
  </code></pre>
  
  <p>The code:</p>
  
  <pre><code># Block visits from semalt.com
  RewriteEngine on 
  RewriteCond %{HTTP_REFERER} ^http://([^.]+\.)*semalt\.com [NC]
  RewriteRule .* - [F]
  </code></pre>
  
  <p>Any idea how these referrers are bypassing this rule (which I found online) and how I can fully prevent them?</p>