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【转】Classful IPv4 addressing definition

2024-09-28 05:14:01   221人阅读

Classful addressing definition

 

ClassLeading
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

【转】Classful IPv4 addressing definition


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