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User Manual 
Aolynk DR814Q ADSL2+ Broadband Router 

9  Appendix – IP Address and Subnet Mask

 

71 

s the network ID and the rest is the host Dither 

length of the network ID d

ds on the cla

e network (refer to sectio

 

“Clas

 structure of the IP ad

tructure

dress

The starting part of every IP address i

epen

es”). Tabl

ss of th

escribes the

n 9.1.2 

dress. 

able 9-1 S

 of the IP ad

 

Class A  

Network ID 

Host ID  

Class B  

Network ID  

Host ID  

Class C  

Network ID  

Host ID  

 

The following are some valid IP address examples:  

Class A: 10.30.6.125 (network ID = 10, host ID= 30.6.125) 

rk ID = 129.88, host ID = 16.49) 

hosts 

s such as enterprises and governments.  

ver two million (2,097,152 exactly) 

ss

Inter

lly of this class networks. 

Follo

dress: 

z 

an IP address is to look at its number in 

 number is from 192 to 223. 

(The numbers for special use are not given here.) 

Class B: 129.88.16.49 (netwo

Class C: 192.60.201.11 (network ID = 192.60.201, host ID = 11) 

Three common IP addresses are of Cass A, B, and C. (Class D is for special use and is 

beyond the scope of this discussion.) These classes have different uses and 

characteristics. 

The class A network is the largest on the Internet. This allows at least 16 million 

per network. Such 126 class A networks can hold at least two billion PCs. These 

enormous networks are quite suitable for the LAN or Internet fundamental 

organizations such as Internet service provider (ISP).  

The class B network is relatively smaller than the class A network, but it still allows 

16,384 class B networks and 65,000 hosts in each class B network. This kind of 

network is suitable for the large organization

The class C network is the smallest one. It allows o

cla

 C networks and 254 hosts in each class C network. The LANs connecting to the 

net are usua

wing are the key points about the IP ad

The easiest way to determine the class of 

the field 1: 

Class A: The number is from 1 to 126. 

Class B: The number is from 128 to 191. 

Class C: The