Installation guide

340 Installation Guide for Clients
The first three fields (w, x and, y) represent a range of possible numbers
from
000 through 255.
The fourth field (z) represents a range of possible numbers from 1
through 254.
Every IP address has two parts: the network number, and the node
number.
• The network number identifies which network a computer is on. All
computers on a given network must have the same network number.
• The node number identifies a computer within a network (also called
a node). The node number for each computer on a given network
must be unique.
The IP address class determines how Microsoft TCP/IP partitions the
IP address between the network number and the node number. There
are three IP address classes: A, B, and C. Each class has different rules
for how it assigns the network and node numbers.
The following table shows how the different IP address classes assign
the network number and the node number within an IP address.
IP Address Partitioning
IP address class IP address Network
number
Node number
A w.x.y.z w x.y.z
B w.x.y.z w.x y.z
C w.x.y.z w.x.y z
The class of an IP address can be determined by the value of the first
number in the address (that is, the “w”
number). Class A addresses
begin with 127 or less. Class B addresses begin with a number from 128
through 191. Class C addresses begin with a number greater than or
equal to 192.
The following IP address is class C because the first number in the
address (the “w” number) is 192:
192.001.001.142
In this example the first three numbers (the “
w.x.y
”
numbers, including
periods) form the network number:
192.001.001
The last number (the “z” number) forms the node number:
142