3Com SuperStack 3 3250 Implementation Manual page 109

referred to as a field or an octet. Decimal notation converts the value of
each field into a decimal number, and the fields are separated by dots.
Figure 33 Dotted Decimal Notation for IP Addresses
10011110.01100101.00001010.00100000
The decimal value of an octet whose bits are all 1s is 255.
Network Portion
The location of the boundary between the network part and the host
part depends on the class that the central agency assigns to your
network. The three primary classes of IP addresses are as follows:
Class A address — Uses 8 bits for the network part and 24 bits for
the host part. Although only a few Class A networks can be created,
each can contain a very large number of hosts.
Class B address — Uses 16 bits for the network part and 16 bits for
the host part.
Class C address — Uses 24 bits for the network part and 8 bits for
the host part. Each Class C network can contain only 254 hosts, but
many such networks can be created.
The high-order bits of the network part of the address designate the IP
network class. See Table
Table 9 How Address Class Corresponds to the Address Number
Address Class
A
B
C
158.101.10.32
9.
High-order Bits
0nnnnnnn
10nnnnnn
11nnnnnn
IP Addresses
= Binary notation
= Decimal notation
Address Number
(Decimal)
0-127
128-191
192-254
109