【转】Classful IPv4 addressing definition

最新推荐文章于 2024-08-09 11:02:53 发布

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最新推荐文章于 2024-08-09 11:02:53 发布

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原文链接：http://www.cnblogs.com/ybluo/p/6921427.html

本文详细介绍了IPv4中不同类别的地址划分方式，包括Class A、Class B、Class C、Class D（多播）及Class E（保留）的具体定义。文中列出了每类地址的前缀、网络号位数、主机号位数、网络数量、每个网络中的地址数量等关键信息。

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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