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Class
Value of
First Octet
A
1-126
B
128-191
C
192-223
Any value between 0 and 255 is valid as a host ID octet except for those
values the InterNIC reserves for other purposes.
Value
0, 255
127
224-254
Subnetting and Subnet Masks
Subnetting divides a network address into sub-network addresses to
accommodate more than one physical network on a logical network.
For example:
A Class B company has 100 LANs (Local Area Networks) with 100 to
200 nodes on each LAN. To classify the nodes by its LANs on one
main network, this company segments the network address into 100
sub-network addresses. If the Class B network address is 150.1.x.x, the
address can be segmented further from 150.1.1.x through 150.1.100.x
Network ID
First octet
First two
octets
First two
octets
Purpose
Subnet masking
Loopback testing and interprocess communication on
local devices
IGMP multicast and other special protocols.
ASUS CX200 Internet Camera
Host ID
Number of Hosts
Last three
16,387,064
octets
Last two
64,516
octets
Last octet
254
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