title: Number of Networks
body: <p>If I will have this Class A Subnet</p>
  
  <p>Class A:</p>
  
  <p>Default Subnet Mask : 255.0.0.0
  Host per network : 16,777,214
  Number of networks : 128</p>
  
  <hr>
  
  <p>How can I find the number of Networks? (I mean the number 128 above)</p>
  
  <hr>
  
  <p>I can find the host per network by using : 256^(number of zeroes) - 2
  example . 255.0.0.0</p>
  
  <p>What I did is : 256^3 = Answer - 2 I used the exponent 3 because the sub-net has 3 zeroes in it.</p>
  
  <p>but what if I will use 255.255.240.0. Can I still use that formula above to get the Host per Network?</p>