The
number of addresses in a class C block is smaller than the needs of most
organizations.
Class
D addresses are used for multicasting; there is only one block in this class.
Class
E addresses are reserved for special purposes; most of the block is wasted.
Private
networks
•
Of the approximately four billion addresses
allowed in IPv4, three ranges of address
are reserved for use in private network.
The following are the three ranges
reserved for private networks
   Address Range |
Number of addresses
|
Classful
description
|
Largest CIDR block
|
|
10.0.0.0–10.255.255.255
|
16777216
|
Single Class A
|
10.0.0.0/8
|
 172.16.0.0–172.31.255.255 |
1048576
|
Contiguous range of 16 Class B
blocks
|
172.16.0.0/12
|
 192.168.0.0–192.168.255.255 |
65536
|
Contiguous range of 256 Class C
blocks
|
192.168.0.0/16
|
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