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i-Rec B104
#2. Utilizing IP Addresses on Local Network
#2.1. Introduction
Most of our business is done via Internet. We play with information by transmitting through e-
mails and searching the Internet. IP address is what we utilize to access the Internet.
Currently used IP addresses are limited. There are 5 classes', and a network contains many IP
addresses. A network can hold limited IP addresses. The numbers depend on network class.
There are five classes are from A to E, and the most common one is the C class network.
#2.2. IP Construction and Network class
1) IP construction
xxx
xxx
xxx
X1
X2
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
- There is a total number of 128 A-class networks 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 in the world is 65,534.
C class: 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.
D class: A network that contains IP addresses from 224 to 239 at room 'X1'.
- D-class network is for multicasting, and it is not allowed for common users.
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xxx
(xxx: 0 – 255)
X3
X4
2003. 06. 30 (v 1.4)
Appendix
WEBGATE Inc.
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