Rugged Outback ELX4-60 Appendix #2 Utilizing IP Addresses on Local Network, #2.1 Introduction

APPENDIX ELX4 -60

Appendix #2 Utilizing IP Addresses on Local Network

#2.1 Introduction

Most of our businesses are done via Internet, lately. We play with information by transmitting through e- mails and searching the world of Internet. IP address is what we utilize to access to the Internet.

Currently used IP addresses are limited. And there are 5 classes’ networks in the world for now, and a network contains lots of IP addresses. A network can hold limited IP addresses. The numbers depend on network class. 5 classes are from A to E, and the most common one is C class network.

#2.2 IP construction and Network class

1) IP construction

xxx xxx xxx xxx

X1 X2 X3 X4

(	(xxx: 0 – 255)
	e.g. 192.168.1.1

2) Network class

A class: A network that contains IP addresses from 0 to 127 at room ‘X1’.

Network ID: X1

Host ID: X2, X3, X4

Total number of A-class networks is 128 in the world.

B class: A network that contains IP addresses from 127 to 191 at room ‘X1’.

Network ID: X1, X2

Host ID: X3, X4

Total number of B-class networks is 65,534 in the world.

Cclass: A network that contains IP addresses from 192 to 223 at room ‘X1’. Network ID: X1, X2, X3

Host ID: X4

It is the most common network in the world, and the total number of C-class networks is 2,097,152

Dclass: A network that contains IP addresses from 224 to 239 at room ‘X1’. D-class network is for multicasting, and it is not allowed to use for common users.

E class : A network that contains IP addresses from 240 to 225 at room ‘X1’. E-class network is

reserved.

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