network/subnetmask - Tomocha WikiPlus

Last Update: 2009-11-13 (金) 17:44:09 (5519d)

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CIDR 対応表 †

IPv4 †

CIDR	MASK					HOST数
/0	0.0.0.0	256	256	256	256	4,294,967,296
/1	128.0.0.0	128	256	256	256	2,147,483,648
/2	192.0.0.0	64	256	256	256	1,073,741,824
/3	224.0.0.0	32	256	256	256	536,870,912
/4	240.0.0.0	16	256	256	256	268,435,456
/5	248.0.0.0	8	256	256	256	134,217,728
/6	252.0.0.0	4	256	256	256	67,108,864
/7	254.0.0.0	2	256	256	256	33,554,432
/8	255.0.0.0	1	256	256	256	16,777,216
/9	255.128.0.0		128	256	256	8,388,608
/10	255.192.0.0		64	256	256	4,194,304
/11	255.224.0.0		32	256	256	2,097,152
/12	255.240.0.0		16	256	256	1,048,576
/13	255.248.0.0		8	256	256	524,288
/14	255.252.0.0		4	256	256	262,144
/15	255.254.0.0		2	256	256	131,072
/16	255.255.0.0		1	256	256	65,536
/17	255.255.128.0			128	256	32,768
/18	255.255.192.0			64	256	16,384
/19	255.255.224.0			32	256	8,192
/20	255.255.240.0			16	256	4,096
/21	255.255.248.0			8	256	2,048
/22	255.255.252.0			4	256	1,024
/23	255.255.254.0			2	256	512
/24	255.255.255.0			1	256	256
/25	255.255.255.128				128	128
/26	255.255.255.192				64	64
/27	255.255.255.224				32	32
/28	255.255.255.240				16	16
/29	255.255.255.248				8	8
/30	255.255.255.252				4	4
/31	255.255.255.254				2	2
/32	255.255.255.255				1	1

IPv6 †

CIDR		/48 * n	/64 * n
/16		4,294,967,296		0000::/16
/17		2,147,483,648
/18		1,073,741,824
/19		536,870,912
/20		268,435,456		0000:0XXX::/20
/21		134,217,728
/22		67,108,864
/23		33,554,432
/24		16,777,216		0000:00XX::/24
/25		8,388,608
/26		4,194,304
/27		2,097,152
/28		1,048,576		0000:000X::/28
/29		524,288
/30		262,144
/31		131,072
/32		65,536	570,899,077,082,384 * 10^31	0000:0000::/32
/33		32,768	871,122,859,317,602 * 10^26
/34		16,384	265,845,599,156,983 * 10^22
/35		8,192	162,259,276,829,213 *10^18
/36		4,096	198,070,406,285,661 * 10^14	0000:0000:0XXX::/36
/37		2,048	483,570,327,845,852 * 10^10
/38		1,024	236,118,324,143,482 * 10^7
/39		512	2,305,843,009,213,690,000
/40		256	4,503,599,627,370,500	0000:0000:00XX::/40
/41		128	17,592,186,044,416
/42		64	137,438,953,472
/43		32	2,147,483,648
/44		16	67,108,864	0000:0000:000X::/44
/45		8	4,194,304
/46		4	524,288
/47		2	131,072
/48		1	65,536	0000:0000:0000::/48
/49			32,768
/50			16,384
/51			8,192
/52			4,096	0000:0000:0000:0XXX::/52
/53			2,048
/54			1,024
/55			512
/56			256	0000:0000:0000:00XX::/56
/57			128
/58			64
/59			32
/60			16	0000:0000:0000:000X::/60
/61			8
/62			4
/63			2
/64			1	0000:0000:0000:0000::/64
/128				0000:0000:0000:0000:0000:0000:0000:0000/128

リンク †