title: Query on class B private address range
body: <p>This is the range for class B private address range.</p>
  
  <p><code>172.16.0.0 - 176.31.255.255</code></p>
  
  <p>prefix notation for this is <code>172.16.0.0/12</code></p>
  
  <p>As per prefix notation, 8 bits of left most octet and left most 4 bits in second octet can only be used to derive network ID in the IP address.</p>
  
  <p>So, I can derive network address using x in  xxxxxxxx.xxxx0000.00000000.00000000</p>
  
  <p><em>My question:</em></p>
  
  <p>Using leftmost 12 bits, How can i derive 172.17.0.0 and 172.18.0.0 network address? In general, How can i derive <code>172.16-172.31</code> range using left most 12 bits(mentioned as x)?</p>