Compaq 222863-001 - TaskSmart W2200 Model 10 Administration Manual page 111

Total 8 bits
0
Class A
1 0
Class B
0
1 1
Class C
Figure B-4. Address class division
An IP address is divided into two parts: networks and hosts. The left-most part
of the address denotes the network. The right-most part of the address denotes
the host address on the network. The subnet mask denotes which part of the IP
address responds to the network and which part of the IP address represents
the unique host on the network. See Table B-1 for examples of addresses that
are broken into networks and the number of devices that each can support.
Class Subnet Host Networks
Range
A 1.0.0.1-126 254
through
255.255.254
B 128.0.0.1 through 65,535
191.255.255.254
C 192.0.0.1 through 4,294,967,295
223.255.255.254
8 bits
7 bits
14 bits
21 bits
Table B-1
Class-Based Subnets
Hosts
4,294,967,295
65,535
254
8 bits 8 bits
24 bits
16 bits
8 bits
Decimal Binary
Mask
255.0.0.0 11111111000000000000000000000000
(8-bits)
255.255.0.0 11111111111111110000000000000000
(16-bits)
255.255.255.0 11111111111111111111111100000000
(24-bits)
Networking Basics B-7