LevelOne GSW-2690 Manuale Utente

 

With the classful addressing, it divides IP address into three classes, class A, 

class B and class C. The rest of IP addresses are for multicast and broadcast. The 
bit length of the network prefix is the same as that of the subnet mask and is 
denoted as IP address/X, for example, 192.168.1.0/24. Each class has its address 
range described below. 

 

Class A:  

Address is less than 126.255.255.255. There are a total of 126 networks can 

be defined because the address 0.0.0.0 is reserved for default route and 
127.0.0.0/8 is reserved for loopback function. 

 

 

0 

  

  

 

 

 

Class B:  

IP address range between 128.0.0.0 and 191.255.255.255. Each class B 

network has a 16-bit network prefix followed 16-bit host address. There are 16,384 
(2^14)/16 networks able to be defined with a maximum of 65534 (2^16 –2) hosts 
per network.  

 

 

10 

  

  

 

 

Class C:  

IP address range between 192.0.0.0 and 223.255.255.255. Each class C 

network has a 24-bit network prefix followed 8-bit host address. There are 
2,097,152 (2^21)/24 networks able to be defined with a maximum of 254 (2^8 –2) 
hosts per network.  

 

 

110 

  

  

 

Bit #      0  1                  7 8                                                  31 

Network address                  Host address 

Bit #      01 2                              15 16                                 31 

Network address                     Host address 

Bit #  0 1 2  3                                     23 24            31 

Network address                          Host address