【转】Classful IPv4 addressing definition

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

时间： 2024-12-08 03:16:01

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