Bit-wise Representation

Bit-wise Representation

In the following table:

• n indicates a bit used for the network ID.
• H indicates a bit used for the host ID.
• X indicates a bit without a specified purpose.

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

224.  0.  0.  0 = 11100000.00000000.00000000.00000000

239.255.255.255 = 11101111.11111111.11111111.11111111

                  1110XXXX.XXXXXXXX.XXXXXXXX.XXXXXXXX

Class E

240.  0.  0.  0 = 11110000.00000000.00000000.00000000

255.255.255.255 = 11111111.11111111.11111111.11111111

                  1111XXXX.XXXXXXXX.XXXXXXXX.XXXXXXXX