Reference Guide for the Model FR314 Cable/DSL Firewall Router
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 follow figure shows the three main address classes, including network and host sections of the address for each address type.
Class A
Network | Node | ||
Class B |
|
| |
|
|
|
|
|
|
|
|
Network | Node | ||
Class C |
|
| |
|
|
|
|
|
|
|
|
| Network |
| Node |
7261
Figure B-1. Three Main Address Classes
The five address classes are:
•Class A
Class A addresses can have up to 16,777,214 hosts on a single network. They use an
1.x.x.x to 126.x.x.x.
•Class B
Class B addresses can have up to 65,354 hosts on a network. A Class B address uses a
128.1.x.x to 191.254.x.x.
•Class C
Class C addresses can have 254 hosts on a network. Class C addresses use 24 bits for the network address and eight bits for the node. They are in this range:
192.0.1.x to 223.255.254.x.
Network and Routing Basics |
