AppSIM 技术中文站

子网掩码表及计算方法

host			VLSM	Subnet Mask	subnet
n-2			/
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n	log2 n		(32 - log2 n) 		256/n
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8	3		29	255.255.255.248	32 
16	4		28	255.255.255.240	16 
32	5		27	255.255.255.224	8
64	6		26	255.255.255.192	4 
128	7		25	255.255.255.128	2 
256	8		24	255.255.255.0	1 
512	9		23	255.255.254.0 
1024	10		22	255.255.252.0 
2048	11		21	255.255.248.0 
4096	12		20	255.255.240.0 
8192	13		19	255.255.224.0 
16384	14		18	255.255.192.0 
32768	15		17	255.255.128.0 
65536	16		16	255.255.0.0