title: Scanning an entire ip range / subnet for port 80 open?
body: <p>I need a fast and efficient way to scan an ip range for port 80 open.</p>
  
  <p>So for example if I wanted to scan OVH IP range "46.105.0.0/16" I need it to scan every ip in that range and output a list of every ip with port 80 open.</p>
  
  <pre><code>46.105.0.51
  46.105.0.72
  46.105.0.91
  46.105.0.7
  46.105.0.15
  </code></pre>
  
  <p>I need to scan multiple subnets and I need it to output to a file.</p>
  
  <p>Edit: I'm also running CentOS on my dedicated box w/ a 1Gbit uplink.</p>