Classful addressing definition

Class Leading
bits		 Size of network
number bit field		 Size of rest
bit field		 Number
of networks		 Addresses
per network		 Total addresses
in class

Start

address

 End address
Class A     0     8     24     128 (27)     16,777,216 (224)     2,147,483,648 (231) 0.0.0.0 127.255.255.255
Class B     10     16     16     16,384 (214)     65,536 (216)     1,073,741,824 (230) 128.0.0.0 191.255.255.255
Class C     110     24     8     2,097,152 (221)     256 (28)     536,870,912 (229) 192.0.0.0 223.255.255.255
Class D (multicast)     1110     not defined     not defined     not defined     not defined     268,435,456 (228) 224.0.0.0 239.255.255.255
Class E (reserved)     1111     not defined     not defined     not defined     not defined     268,435,456 (228) 240.0.0.0 255.255.255.255

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