0.15.255. These represent a 32-bit binary
value, and each of the four sets of numbers is called an octet. Each octet includes a number
range from 0 to 255. The first octet usually signifies the class to which the network belongs.
There are three classes of networks:
. Class A networks have a first octet in the range of 1??“126, and the last three octets
define the host. Each Class A network has up to 16,777,214 hosts. Of these, a first
octet of 10 is reserved for local networks (127.0.0.0 is reserved for the loopback range).
CHAPTER 25 Setting Up Networks and Samba 508
. Class B networks have a first octet in the range of 128??“191. In this range, the first
octet of 128 is also reserved for local networks. The first two octets belong to the
network, the last two to the host. There are 16,382 Class B networks, with 65,534
possible hosts.
. Class C networks have a first octet in the range of 192??“223. In this range, the first
octet of 192 is also reserved for local networks. The first three octets belong to the
network, with only the last octet belonging to the host.
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