For efficiency in routing, networks were broken down into
three classes, so routing can begin simply by identifying the
leading byte of information in the IP address. The three IP
addresses that InterNIC assigns are class A, B, and C. The
network class determines what each of the four IP address
sections identify as shown in
Table A.1
:
Table A.1 IP Address Class Format
Class
First
Address
Byte xxx.
Second
Address
Byte xxx.
Third
Address
Byte xxx.
Fourth
Address
Byte xxx
A
Network.
Host.
Host.
Host
B
Network.
Network.
Host.
Host
C
Network.
Network.
Network.
Host
Explained in more detail in the table "
Network Class
Characteristics
," you will see how each network class differs
further by the leading bit identifier, the address range, the
number of each type available, and the maximum number of
hosts each class allows.
Table A.2 Network Class Characteristics
Class
Leading
Bit
Identifier
Address
Range
Maximum
number
of
networks
in the
class
Maximum
hosts in
the
network
A
0
0.0.0.0 to
127.255.255.255
126
Over 16
Million
B
10
128.0.0.0 to
191.255.255.255
16,382
65,534
C
110
192.0.0.0 to
223.255.255.255
Over 2
Million
254
Next topic:
Configuring IP parameter
s
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