1. IPv4 Address Classes block
Class
Address
Starts of bits
Network bits
Host bits
Function
A
0.0.0.0 ~ 127.255.255.255
0
7
24
Unicast
B
128.0.0.0 ~ 191.255.255.255
10
14
16
Unicast
C
192.0.0.0 ~ 223.255.255.255
110
21
8
Unicast
D
224.0.0.0 ~ 239.255.255.255
1110
Multicast
E
240.0.0.0 ~ 255.255.255.255
1111
Reserved
2. [...]
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