CIDR快速对照表

Class	Network Address	Number of Hosts	Netmask
	/0	4,294,967,296	`0.0.0.0`
	/1	2,147,483,648	`128.0.0.0`
	/2	1,073,741,824	`192.0.0.0`
	/3	536,870,912	`224.0.0.0`
	/4	240,435,456	`240.0.0.0`
	/5	134,217,728	`248.0.0.0`
	/6	67,108,864	`252.0.0.0`
	/7	33,554,432	`254.0.0.0`
A	/8	16,777,216	`255.0.0.0`
	/9	8,388,608	`255.128.0.0`
	/10	4,194,304	`255.192.0.0`
	/11	2,097,152	`255.224.0.0`
	/12	1,048,576	`255.240.0.0`
	/13	524,288	`255.248.0.0`
	/14	262,144	`255.252.0.0`
	/15	131,072	`255.254.0.0`
B	/16	65,536	`255.255.0.0`
	/17	32,768	`255.255.128.0`
	/18	16,384	`255.255.192.0`
	/19	8,192	`255.255.224.0`
	/20	4,096	`255.255.240.0`
	/21	2,048	`255.255.248.0`
	/22	1,024	`255.255.252.0`
	/23	512	`255.255.254.0`
C	/24	256	`255.255.255.0`
	/25	128	`255.255.255.128`
	/26	64	`255.255.255.192`
	/27	32	`255.255.255.224`
	/28	16	`255.255.255.240`
	/29	8	`255.255.255.248`
	/30	4	`255.255.255.252`
	/31	2	`255.255.255.254`
	/32	1	`255.255.255.255`

IPv6 CIDR	Start of range	End of range	Total addresses	Total /64 subnets
`::/2`	`::`	`3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	85,070,591,730,234,615,865,843,651,857,942,052,864	4,611,686,018,427,387,904
`::/1`	`::`	`7fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	170,141,183,460,469,231,731,687,303,715,884,105,728	9,223,372,036,854,775,808
`::/0`	`::`	`ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	340,282,366,920,938,463,463,374,607,431,768,211,456	18,446,744,073,709,551,616
`2001:db8::/128`	`2001:db8::`	`2001:db8::`	1	-
`2001:db8::/127`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:0001`	2	-
`2001:db8::/126`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:0003`	4	-
`2001:db8::/125`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:0007`	8	-
`2001:db8::/124`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:000f`	16	-
`2001:db8::/123`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:001f`	32	-
`2001:db8::/122`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:003f`	64	-
`2001:db8::/121`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:007f`	128	-
`2001:db8::/120`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:00ff`	256	-
`2001:db8::/119`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:01ff`	512	-
`2001:db8::/118`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:03ff`	1,024	-
`2001:db8::/117`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:07ff`	2,048	-
`2001:db8::/116`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:0fff`	4,096	-
`2001:db8::/115`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:1fff`	8,192	-
`2001:db8::/114`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:3fff`	16,384	-
`2001:db8::/113`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:7fff`	32,768	-
`2001:db8::/112`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0000:ffff`	65,536	-
`2001:db8::/111`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0001:ffff`	131,072	-
`2001:db8::/110`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0003:ffff`	262,144	-
`2001:db8::/109`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0007:ffff`	524,288	-
`2001:db8::/108`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:000f:ffff`	1,048,576	-
`2001:db8::/107`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:001f:ffff`	2,097,152	-
`2001:db8::/106`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:003f:ffff`	4,194,304	-
`2001:db8::/105`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:007f:ffff`	8,388,608	-
`2001:db8::/104`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:00ff:ffff`	16,777,216	-
`2001:db8::/103`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:01ff:ffff`	33,554,432	-
`2001:db8::/102`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:03ff:ffff`	67,108,864	-
`2001:db8::/101`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:07ff:ffff`	134,217,728	-
`2001:db8::/100`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:0fff:ffff`	268,435,456	-
`2001:db8::/99`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:1fff:ffff`	536,870,912	-
`2001:db8::/98`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:3fff:ffff`	1,073,741,824	-
`2001:db8::/97`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:7fff:ffff`	2,147,483,648	-
`2001:db8::/96`	`2001:db8::`	`2001:db8:0000:0000:0000:0000:ffff:ffff`	4,294,967,296	-
`2001:db8::/95`	`2001:db8::`	`2001:db8:0000:0000:0000:0001:ffff:ffff`	8,589,934,592	-
`2001:db8::/94`	`2001:db8::`	`2001:db8:0000:0000:0000:0003:ffff:ffff`	17,179,869,184	-
`2001:db8::/93`	`2001:db8::`	`2001:db8:0000:0000:0000:0007:ffff:ffff`	34,359,738,368	-
`2001:db8::/92`	`2001:db8::`	`2001:db8:0000:0000:0000:000f:ffff:ffff`	68,719,476,736	-
`2001:db8::/91`	`2001:db8::`	`2001:db8:0000:0000:0000:001f:ffff:ffff`	137,438,953,472	-
`2001:db8::/90`	`2001:db8::`	`2001:db8:0000:0000:0000:003f:ffff:ffff`	274,877,906,944	-
`2001:db8::/89`	`2001:db8::`	`2001:db8:0000:0000:0000:007f:ffff:ffff`	549,755,813,888	-
`2001:db8::/88`	`2001:db8::`	`2001:db8:0000:0000:0000:00ff:ffff:ffff`	1,099,511,627,776	-
`2001:db8::/87`	`2001:db8::`	`2001:db8:0000:0000:0000:01ff:ffff:ffff`	2,199,023,255,552	-
`2001:db8::/86`	`2001:db8::`	`2001:db8:0000:0000:0000:03ff:ffff:ffff`	4,398,046,511,104	-
`2001:db8::/85`	`2001:db8::`	`2001:db8:0000:0000:0000:07ff:ffff:ffff`	8,796,093,022,208	-
`2001:db8::/84`	`2001:db8::`	`2001:db8:0000:0000:0000:0fff:ffff:ffff`	17,592,186,044,416	-
`2001:db8::/83`	`2001:db8::`	`2001:db8:0000:0000:0000:1fff:ffff:ffff`	35,184,372,088,832	-
`2001:db8::/82`	`2001:db8::`	`2001:db8:0000:0000:0000:3fff:ffff:ffff`	70,368,744,177,664	-
`2001:db8::/81`	`2001:db8::`	`2001:db8:0000:0000:0000:7fff:ffff:ffff`	140,737,488,355,328	-
`2001:db8::/80`	`2001:db8::`	`2001:db8:0000:0000:0000:ffff:ffff:ffff`	281,474,976,710,656	-
`2001:db8::/79`	`2001:db8::`	`2001:db8:0000:0000:0001:ffff:ffff:ffff`	562,949,953,421,312	-
`2001:db8::/78`	`2001:db8::`	`2001:db8:0000:0000:0003:ffff:ffff:ffff`	1,125,899,906,842,624	-
`2001:db8::/77`	`2001:db8::`	`2001:db8:0000:0000:0007:ffff:ffff:ffff`	2,251,799,813,685,248	-
`2001:db8::/76`	`2001:db8::`	`2001:db8:0000:0000:000f:ffff:ffff:ffff`	4,503,599,627,370,496	-
`2001:db8::/75`	`2001:db8::`	`2001:db8:0000:0000:001f:ffff:ffff:ffff`	9,007,199,254,740,992	-
`2001:db8::/74`	`2001:db8::`	`2001:db8:0000:0000:003f:ffff:ffff:ffff`	18,014,398,509,481,984	-
`2001:db8::/73`	`2001:db8::`	`2001:db8:0000:0000:007f:ffff:ffff:ffff`	36,028,797,018,963,968	-
`2001:db8::/72`	`2001:db8::`	`2001:db8:0000:0000:00ff:ffff:ffff:ffff`	72,057,594,037,927,936	-
`2001:db8::/71`	`2001:db8::`	`2001:db8:0000:0000:01ff:ffff:ffff:ffff`	144,115,188,075,855,872	-
`2001:db8::/70`	`2001:db8::`	`2001:db8:0000:0000:03ff:ffff:ffff:ffff`	288,230,376,151,711,744	-
`2001:db8::/69`	`2001:db8::`	`2001:db8:0000:0000:07ff:ffff:ffff:ffff`	576,460,752,303,423,488	-
`2001:db8::/68`	`2001:db8::`	`2001:db8:0000:0000:0fff:ffff:ffff:ffff`	1,152,921,504,606,846,976	-
`2001:db8::/67`	`2001:db8::`	`2001:db8:0000:0000:1fff:ffff:ffff:ffff`	2,305,843,009,213,693,952	-
`2001:db8::/66`	`2001:db8::`	`2001:db8:0000:0000:3fff:ffff:ffff:ffff`	4,611,686,018,427,387,904	-
`2001:db8::/65`	`2001:db8::`	`2001:db8:0000:0000:7fff:ffff:ffff:ffff`	9,223,372,036,854,775,808	-
`2001:db8::/64`	`2001:db8::`	`2001:db8:0000:0000:ffff:ffff:ffff:ffff`	18,446,744,073,709,551,616	1
`2001:db8::/63`	`2001:db8::`	`2001:db8:0000:0001:ffff:ffff:ffff:ffff`	36,893,488,147,419,103,232	2
`2001:db8::/62`	`2001:db8::`	`2001:db8:0000:0003:ffff:ffff:ffff:ffff`	73,786,976,294,838,206,464	4
`2001:db8::/61`	`2001:db8::`	`2001:db8:0000:0007:ffff:ffff:ffff:ffff`	147,573,952,589,676,412,928	8
`2001:db8::/60`	`2001:db8::`	`2001:db8:0000:000f:ffff:ffff:ffff:ffff`	295,147,905,179,352,825,856	16
`2001:db8::/59`	`2001:db8::`	`2001:db8:0000:001f:ffff:ffff:ffff:ffff`	590,295,810,358,705,651,712	32
`2001:db8::/58`	`2001:db8::`	`2001:db8:0000:003f:ffff:ffff:ffff:ffff`	1,180,591,620,717,411,303,424	64
`2001:db8::/57`	`2001:db8::`	`2001:db8:0000:007f:ffff:ffff:ffff:ffff`	2,361,183,241,434,822,606,848	128
`2001:db8::/56`	`2001:db8::`	`2001:db8:0000:00ff:ffff:ffff:ffff:ffff`	4,722,366,482,869,645,213,696	256
`2001:db8::/55`	`2001:db8::`	`2001:db8:0000:01ff:ffff:ffff:ffff:ffff`	9,444,732,965,739,290,427,392	512
`2001:db8::/54`	`2001:db8::`	`2001:db8:0000:03ff:ffff:ffff:ffff:ffff`	18,889,465,931,478,580,854,784	1,024
`2001:db8::/53`	`2001:db8::`	`2001:db8:0000:07ff:ffff:ffff:ffff:ffff`	37,778,931,862,957,161,709,568	2,048
`2001:db8::/52`	`2001:db8::`	`2001:db8:0000:0fff:ffff:ffff:ffff:ffff`	75,557,863,725,914,323,419,136	4,096
`2001:db8::/51`	`2001:db8::`	`2001:db8:0000:1fff:ffff:ffff:ffff:ffff`	151,115,727,451,828,646,838,272	8,192
`2001:db8::/50`	`2001:db8::`	`2001:db8:0000:3fff:ffff:ffff:ffff:ffff`	302,231,454,903,657,293,676,544	16,384
`2001:db8::/49`	`2001:db8::`	`2001:db8:0000:7fff:ffff:ffff:ffff:ffff`	604,462,909,807,314,587,353,088	32,768
`2001:db8::/48`	`2001:db8::`	`2001:db8:0000:ffff:ffff:ffff:ffff:ffff`	1,208,925,819,614,629,174,706,176	65,536
`2001:db8::/47`	`2001:db8::`	`2001:db8:0001:ffff:ffff:ffff:ffff:ffff`	2,417,851,639,229,258,349,412,352	131,072
`2001:db8::/46`	`2001:db8::`	`2001:db8:0003:ffff:ffff:ffff:ffff:ffff`	4,835,703,278,458,516,698,824,704	262,144
`2001:db8::/45`	`2001:db8::`	`2001:db8:0007:ffff:ffff:ffff:ffff:ffff`	9,671,406,556,917,033,397,649,408	524,288
`2001:db8::/44`	`2001:db8::`	`2001:db8:000f:ffff:ffff:ffff:ffff:ffff`	19,342,813,113,834,066,795,298,816	1,048,576
`2001:db8::/43`	`2001:db8::`	`2001:db8:001f:ffff:ffff:ffff:ffff:ffff`	38,685,626,227,668,133,590,597,632	2,097,152
`2001:db8::/42`	`2001:db8::`	`2001:db8:003f:ffff:ffff:ffff:ffff:ffff`	77,371,252,455,336,267,181,195,264	4,194,304
`2001:db8::/41`	`2001:db8::`	`2001:db8:007f:ffff:ffff:ffff:ffff:ffff`	154,742,504,910,672,534,362,390,528	8,388,608
`2001:db8::/40`	`2001:db8::`	`2001:db8:00ff:ffff:ffff:ffff:ffff:ffff`	309,485,009,821,345,068,724,781,056	16,777,216
`2001:db8::/39`	`2001:db8::`	`2001:db8:01ff:ffff:ffff:ffff:ffff:ffff`	618,970,019,642,690,137,449,562,112	33,554,432
`2001:db8::/38`	`2001:db8::`	`2001:db8:03ff:ffff:ffff:ffff:ffff:ffff`	1,237,940,039,285,380,274,899,124,224	67,108,864
`2001:db8::/37`	`2001:db8::`	`2001:db8:07ff:ffff:ffff:ffff:ffff:ffff`	2,475,880,078,570,760,549,798,248,448	134,217,728
`2001:db8::/36`	`2001:db8::`	`2001:db8:0fff:ffff:ffff:ffff:ffff:ffff`	4,951,760,157,141,521,099,596,496,896	268,435,456
`2001:db8::/35`	`2001:db8::`	`2001:db8:1fff:ffff:ffff:ffff:ffff:ffff`	9,903,520,314,283,042,199,192,993,792	536,870,912
`2001:db8::/34`	`2001:db8::`	`2001:db8:3fff:ffff:ffff:ffff:ffff:ffff`	19,807,040,628,566,084,398,385,987,584	1,073,741,824
`2001:db8::/33`	`2001:db8::`	`2001:db8:7fff:ffff:ffff:ffff:ffff:ffff`	39,614,081,257,132,168,796,771,975,168	2,147,483,648
`2001:db8::/32`	`2001:db8::`	`2001:db8:ffff:ffff:ffff:ffff:ffff:ffff`	79,228,162,514,264,337,593,543,950,336	4,294,967,296
`2001:db8::/31`	`2001:db8::`	`2001:0db9:ffff:ffff:ffff:ffff:ffff:ffff`	158,456,325,028,528,675,187,087,900,672	8,589,934,592
`2001:db8::/30`	`2001:db8::`	`2001:0dbb:ffff:ffff:ffff:ffff:ffff:ffff`	316,912,650,057,057,350,374,175,801,344	17,179,869,184
`2001:db8::/29`	`2001:db8::`	`2001:0dbf:ffff:ffff:ffff:ffff:ffff:ffff`	633,825,300,114,114,700,748,351,602,688	34,359,738,368
`2001:db0::/28`	`2001:db0::`	`2001:0dbf:ffff:ffff:ffff:ffff:ffff:ffff`	1,267,650,600,228,229,401,496,703,205,376	68,719,476,736
`2001:da0::/27`	`2001:da0::`	`2001:0dbf:ffff:ffff:ffff:ffff:ffff:ffff`	2,535,301,200,456,458,802,993,406,410,752	137,438,953,472
`2001:d80::/26`	`2001:d80::`	`2001:0dbf:ffff:ffff:ffff:ffff:ffff:ffff`	5,070,602,400,912,917,605,986,812,821,504	274,877,906,944
`2001:d80::/25`	`2001:d80::`	`2001:0dff:ffff:ffff:ffff:ffff:ffff:ffff`	10,141,204,801,825,835,211,973,625,643,008	549,755,813,888
`2001:d00::/24`	`2001:d00::`	`2001:0dff:ffff:ffff:ffff:ffff:ffff:ffff`	20,282,409,603,651,670,423,947,251,286,016	1,099,511,627,776
`2001:c00::/23`	`2001:c00::`	`2001:0dff:ffff:ffff:ffff:ffff:ffff:ffff`	40,564,819,207,303,340,847,894,502,572,032	2,199,023,255,552
`2001:c00::/22`	`2001:c00::`	`2001:0fff:ffff:ffff:ffff:ffff:ffff:ffff`	81,129,638,414,606,681,695,789,005,144,064	4,398,046,511,104
`2001::/20`	`2001::`	`2001:0fff:ffff:ffff:ffff:ffff:ffff:ffff`	324,518,553,658,426,726,783,156,020,576,256	17,592,186,044,416
`2001::/19`	`2001::`	`2001:1fff:ffff:ffff:ffff:ffff:ffff:ffff`	649,037,107,316,853,453,566,312,041,152,512	35,184,372,088,832
`2001::/18`	`2001::`	`2001:3fff:ffff:ffff:ffff:ffff:ffff:ffff`	1,298,074,214,633,706,907,132,624,082,305,024	70,368,744,177,664
`2001::/17`	`2001::`	`2001:7fff:ffff:ffff:ffff:ffff:ffff:ffff`	2,596,148,429,267,413,814,265,248,164,610,048	140,737,488,355,328
`2001::/16`	`2001::`	`2001:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	5,192,296,858,534,827,628,530,496,329,220,096	281,474,976,710,656
`2001:800::/21`	`2001:800::`	`2001:0fff:ffff:ffff:ffff:ffff:ffff:ffff`	162,259,276,829,213,363,391,578,010,288,128	8,796,093,022,208
`2000::/15`	`2000::`	`2001:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	10,384,593,717,069,655,257,060,992,658,440,192	562,949,953,421,312
`2000::/14`	`2000::`	`2003:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	20,769,187,434,139,310,514,121,985,316,880,384	1,125,899,906,842,624
`2000::/13`	`2000::`	`2007:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	41,538,374,868,278,621,028,243,970,633,760,768	2,251,799,813,685,248
`2000::/12`	`2000::`	`200f:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	83,076,749,736,557,242,056,487,941,267,521,536	4,503,599,627,370,496
`2000::/11`	`2000::`	`201f:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	166,153,499,473,114,484,112,975,882,535,043,072	9,007,199,254,740,992
`2000::/10`	`2000::`	`203f:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	332,306,998,946,228,968,225,951,765,070,086,144	18,014,398,509,481,984
`2000::/9`	`2000::`	`207f:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	664,613,997,892,457,936,451,903,530,140,172,288	36,028,797,018,963,968
`2000::/8`	`2000::`	`20ff:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	1,329,227,995,784,915,872,903,807,060,280,344,576	72,057,594,037,927,936
`2000::/7`	`2000::`	`21ff:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	2,658,455,991,569,831,745,807,614,120,560,689,152	144,115,188,075,855,872
`2000::/6`	`2000::`	`23ff:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	5,316,911,983,139,663,491,615,228,241,121,378,304	288,230,376,151,711,744
`2000::/5`	`2000::`	`27ff:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	10,633,823,966,279,326,983,230,456,482,242,756,608	576,460,752,303,423,488
`2000::/4`	`2000::`	`2fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	21,267,647,932,558,653,966,460,912,964,485,513,216	1,152,921,504,606,846,976
`2000::/3`	`2000::`	`3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff`	42,535,295,865,117,307,932,921,825,928,921,026,432	2,305,843,009,213,693,452