31. Classful Networking Bitwise Representation

  Class A
        0.  0.  0.  0 = 00000000.00000000.00000000.00000000
      127.255.255.255 = 01111111.11111111.11111111.11111111
                        0nnnnnnn.HHHHHHHH.HHHHHHHH.HHHHHHHH
  Class B
      128.  0.  0.  0 = 10000000.00000000.00000000.00000000
      191.255.255.255 = 10111111.11111111.11111111.11111111
                        10nnnnnn.nnnnnnnn.HHHHHHHH.HHHHHHHH
  
  Class C
      192.  0.  0.  0 = 11000000.00000000.00000000.00000000
      223.255.255.255 = 11011111.11111111.11111111.11111111
                        110nnnnn.nnnnnnnn.nnnnnnnn.HHHHHHHH
  
  Class D (multicasting: one-to-many hosts, like video conferencing)
      224.  0.  0.  0 = 11100000.00000000.00000000.00000000
      239.255.255.255 = 11101111.11111111.11111111.11111111
                        1110XXXX.XXXXXXXX.XXXXXXXX.XXXXXXXX
  
  Class E (reserved for research)
      240.  0.  0.  0 = 11110000.00000000.00000000.00000000
      255.255.255.255 = 11111111.11111111.11111111.11111111
                        1111XXXX.XXXXXXXX.XXXXXXXX.XXXXXXXX
      

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