Netgear RH348 User Manual download pdf (Page 26)

Reference Guide for the Model RT328 and Model RH348 ISDN Routers

1-8 Introduction

There are ﬁve standard classes of IP addresses. These address classes have different ways of

determining the network and host sections of the address, allowing for different numbers of hosts

on a network. Each address type begins with a unique bit pattern, which is used by the TCP/IP

software to identify the address class. After the address class has been determined, the software

can correctly identify the host section of the address. The three main address classes are illustrated

in Figure 1-1, which shows the network and host sections of the address for each address type.

Figure 1-1. Three Main Address Classes

Class A addresses can have up to 16,777,214 hosts on a single network. They use an 8-bit network

number and a 24-bit node number. Class A addresses are in this range:

1.x.x.x to 126.x.x.x.

Class B addresses can have up to 65,354 hosts on a network. A Class B address uses a 16-bit

network number and a 16-bit node number. Class B addresses are in this range:

128.1.x.x to 191.254.x.x.

Class C addresses can have 254 hosts on a network. Class C addresses use 24 bits for the network

address and 8 bits for the node. They are in this range:

192.0.1.x to 223.255.254.x.

Class D addresses are used for multicasts (messages sent to many hosts). Class D addresses are in

this range:

224.0.0.0 to 239.255.255.255.

7261

Class A

Network Node

Class B

Class C

Network Node

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Netgear RH348 User Manual Page 26