Rugged Cams ELX DVR 16 Channel - Manual (Page 76)

ELX16-240 APPENDIX
76 2003.09.06 (v 1.0) Rugged CCTV.
#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 t he 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 add resses. 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: 0 – 255)
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.
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 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.
xxx xxx xxx xxx
X1 X2 X3 X4