435 JAN 2006Ver. 5.2DP-3510/3520/3530/4510/4520/4530/6010/6020/60309.3. Network Layer9.3.1. IP AddressAn IP address is a set of four numbers, or octets, that can range in value between 0 and 255. Each octet isseparated by a period (i.e. 192.168.31.1). All devices on a network that runs the TCP/IP protocol suite needa unique IP address. Most machines use a Domain Name, which are easier for people to remember.The IP addresses are actually broken down into three distinct classes, knows as class A, class B and classC addresses.Class A IP addresses contain a number between 1 and 127 before the first dot. In class A address, this firstoctet represents the network address, and the last three octets represent the node or host number.Class B IP addresses can range in value from 128 to 191 for the first octet, but it is the first two octets thatmake up the network address, and the last two octets that make up the host ID.Class C IP addresses can range in value from 192 to 223 for the first octet, and the first three octets makeup the host ID.There are class D and E addresses as well. For these addresses, the first octet is a number greater than223. These addresses are not currently available to be used and are reserved for other purposes.Private networks that do not connect to the Internet (operate internally) allow additional flexibility with IPaddresses. Three classifications are available as shown below:Class A : First octet reserved for the network addressClass B : First two octets reserved for the network addressClass C : First three octets reserved for the network addressClass A : 10.0.0.0 - 10.255.255.255Class B : 172.16.0.0 - 172.31.255.255Class C : 192.168.0.0 - 192.168.255.2550Class A1Class B 01Class C 1Network address represented as0
