Blunet BL-32960M, Installation & User Manual

Page: 216 / 224

216
#3. Utilizing IP address in Local network
1#2.1 Outline
When internet uses, it connects to another server for acquisition of data or email communication through
IP address. So it is not connectable to Internet without IP address.
At present, authorized IP has limits to use in worldwide. And there are 5 grades from A to E in network
that possesses many IP. Most common used network is C grade network.
1#2.2 IP structure and Network grade
1) IP Structure
((xxx: 0 – 255)
2) Network Class
Class A : All networks that are IP addressed in X1 from 0 to 127.
- Network ID: X1
- Host ID: X2, X3, X4
- Total 128 in worldwide is available in grade A.
Class B : All network that is IP addressed in X1 from 128 to 191.
- Network ID: X1, X2
- Host ID: X3, X4
- Available Grade B network in worldwide is totally 65,534.
Class C : All network that is IP addressed in X1 from 192 to 223.
- Network ID: X1, X2, X3
- Host ID: X4
- It is the most general IP address and available Grade B network in worldwide is totally
2,097,152.
Class D : All network that is IP addressed in X1 from 224 to 239.
The network is for Multicast use, but not for general use.
Class E : All network that is IP addressed in X1 from 240 to 255.
The network is withheld to use.
xxx xxx xxx xxx
X1 X2 X3 X4