Reference Guide for the Model RT328 and Model RH348 ISDN Routers
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
Class A
Network | Node |
Class B |
|
Network | Node |
Class C |
|
Network | Node |
7261
Figure
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 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 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.
Introduction |