CIDR Blocks Table IPv4 and IPv6

CIDR Blocks Table IPv4 and IPv6

Definition:

CIDR (Classless Inter-Domain Routing) is a scheme to allocate Internet addresses used in inter-domain routing and Internet Protocol packets. Using CIDR a single IP address can be used to choose several unique IP addresses. It assists routing by permitting blocks of addresses to be assembled into single routing table entries and these groups are commonly called as CIDR blocks which share an initial series of bits in the binary illustration of their IP addresses. The below given blocks table explains the CIDR network address ranges and CIDR Blocks table of IPV4 and IPV6.

CIDR Blocks Table IPv4:
IP/CIDRΔ to last IP addrMaskHosts (*)SizeNotes
a.b.c.d/32+0.0.0.0255.255.255.25511/256 C
a.b.c.d/31+0.0.0.1255.255.255.25421/128 Cd = 0 ... (2n) ... 254
a.b.c.d/30+0.0.0.3255.255.255.25241/64 Cd = 0 ... (4n) ... 252
a.b.c.d/29+0.0.0.7255.255.255.24881/32 Cd = 0 ... (8n) ... 248
a.b.c.d/28+0.0.0.15255.255.255.240161/16 Cd = 0 ... (16n) ... 240
a.b.c.d/27+0.0.0.31255.255.255.224321/8 Cd = 0 ... (32n) ... 224
a.b.c.d/26+0.0.0.63255.255.255.192641/4 Cd = 0, 64, 128, 192
a.b.c.d/25+0.0.0.127255.255.255.1281281/2 Cd = 0, 128
a.b.c.0/24+0.0.0.255255.255.255.0002561 C
a.b.c.0/23+0.0.1.255255.255.254.0005122 Cc = 0 ... (2n) ... 254
a.b.c.0/22+0.0.3.255255.255.252.0001,0244 Cc = 0 ... (4n) ... 252
a.b.c.0/21+0.0.7.255255.255.248.0002,0488 Cc = 0 ... (8n) ... 248
a.b.c.0/20+0.0.15.255255.255.240.0004,09616 Cc = 0 ... (16n) ... 240
a.b.c.0/19+0.0.31.255255.255.224.0008,19232 Cc = 0 ... (32n) ... 224
a.b.c.0/18+0.0.63.255255.255.192.00016,38464 Cc = 0, 64, 128, 192
a.b.c.0/17+0.0.127.255255.255.128.00032,768128 Cc = 0, 128
a.b.0.0/16+0.0.255.255255.255.000.00065,536256 C = 1 B
a.b.0.0/15+0.1.255.255255.254.000.000131,0722 Bb = 0 ... (2n) ... 254
a.b.0.0/14+0.3.255.255255.252.000.000262,1444 Bb = 0 ... (4n) ... 252
a.b.0.0/13+0.7.255.255255.248.000.000524,2888 Bb = 0 ... (8n) ... 248
a.b.0.0/12+0.15.255.255255.240.000.0001,048,57616 Bb = 0 ... (16n) ... 240
a.b.0.0/11+0.31.255.255255.224.000.0002,097,15232 Bb = 0 ... (32n) ... 224
a.b.0.0/10+0.63.255.255255.192.000.0004,194,30464 Bb = 0, 64, 128, 192
a.b.0.0/9+0.127.255.255255.128.000.0008,388,608128 Bb = 0, 128
a.0.0.0/8+0.255.255.255255.000.000.00016,777,216256 B = 1 A
a.0.0.0/7+1.255.255.255254.000.000.00033,554,4322 Aa = 0 ... (2n) ... 254
a.0.0.0/6+3.255.255.255252.000.000.00067,108,8644 Aa = 0 ... (4n) ... 252
a.0.0.0/5+7.255.255.255248.000.000.000134,217,7288 Aa = 0 ... (8n) ... 248
a.0.0.0/4+15.255.255.255240.000.000.000268,435,45616 Aa = 0 ... (16n) ... 240
a.0.0.0/3+31.255.255.255224.000.000.000536,870,91232 Aa = 0 ... (32n) ... 224
a.0.0.0/2+63.255.255.255192.000.000.0001,073,741,82464 Aa = 0, 64, 128, 192
a.0.0.0/1+127.255.255.255128.000.000.0002,147,483,648128 Aa = 0, 128
0.0.0.0/0+255.255.255.255000.000.000.0004,294,967,296256 A
CIDR Blocks Table IPv6:
CIDRStart of rangeEnd of range - Total addressesTotal /64 subnets
0::0/0::ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 340,282,366,920,938,463,463,374,607,431,768,211,45618,446,744,073,709,551,616
f000::/1f000::ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 170,141,183,460,469,231,731,687,303,715,884,105,7289,223,372,036,854,775,808
4000::/24000::7fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 85,070,591,730,234,615,865,843,651,857,942,052,8644,611,686,018,427,387,904
2000::/32000::3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 42,535,295,865,117,307,932,921,825,928,921,026,4322,305,843,009,213,693,452
2000::/42000::2fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 21,267,647,932,558,653,966,460,912,964,485,513,2161,152,921,504,606,846,976
2000::/52000::27ff:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 10,633,823,966,279,326,983,230,456,482,242,756,608576,460,752,303,423,488
2000::/62000::23ff:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 5,316,911,983,139,663,491,615,228,241,121,378,304288,230,376,151,711,744
2000::/72000::21ff:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 2,658,455,991,569,831,745,807,614,120,560,689,152144,115,188,075,855,872
2000::/82000::20ff:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 1,329,227,995,784,915,872,903,807,060,280,344,57672,057,594,037,927,936
2000::/92000::207f:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 664,613,997,892,457,936,451,903,530,140,172,28836,028,797,018,963,968
2000::/102000::203f:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 332,306,998,946,228,968,225,951,765,070,086,14418,014,398,509,481,984
2000::/112000::201f:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 166,153,499,473,114,484,112,975,882,535,043,0729,007,199,254,740,992
2000::/122000::200f:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 83,076,749,736,557,242,056,487,941,267,521,5364,503,599,627,370,496
2000::/132000::2007:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 41,538,374,868,278,621,028,243,970,633,760,7682,251,799,813,685,248
2000::/142000::2003:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 20,769,187,434,139,310,514,121,985,316,880,3841,125,899,906,842,624
2000::/152000::2001:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 10,384,593,717,069,655,257,060,992,658,440,192562,949,953,421,312
2001::/162001::2001:ffff:ffff:ffff:ffff:ffff:ffff:ffff - 5,192,296,858,534,827,628,530,496,329,220,096281,474,976,710,656
2001::/172001::2001:7fff:ffff:ffff:ffff:ffff:ffff:ffff - 2,596,148,429,267,413,814,265,248,164,610,048140,737,488,355,328
2001::/182001::2001:3fff:ffff:ffff:ffff:ffff:ffff:ffff - 1,298,074,214,633,706,907,132,624,082,305,02470,368,744,177,664
2001::/192001::2001:1fff:ffff:ffff:ffff:ffff:ffff:ffff - 649,037,107,316,853,453,566,312,041,152,51235,184,372,088,832
2001::/202001::2001:0fff:ffff:ffff:ffff:ffff:ffff:ffff - 324,518,553,658,426,726,783,156,020,576,25617,592,186,044,416
2001::/212001::2001:07ff:ffff:ffff:ffff:ffff:ffff:ffff - 162,259,276,829,213,363,391,578,010,288,1288,796,093,022,208
2001::/222001::2001:03ff:ffff:ffff:ffff:ffff:ffff:ffff - 81,129,638,414,606,681,695,789,005,144,0644,398,046,511,104
2001::/232001::2001:01ff:ffff:ffff:ffff:ffff:ffff:ffff - 40,564,819,207,303,340,847,894,502,572,0322,199,023,255,552
2001::/242001::2001:00ff:ffff:ffff:ffff:ffff:ffff:ffff - 20,282,409,603,651,670,423,947,251,286,0161,099,511,627,776
2001::/252001::2001:007f:ffff:ffff:ffff:ffff:ffff:ffff - 10,141,204,801,825,835,211,973,625,643,008549,755,813,888
2001::/262001::2001:003f:ffff:ffff:ffff:ffff:ffff:ffff - 5,070,602,400,912,917,605,986,812,821,504274,877,906,944
2001::/272001::2001:001f:ffff:ffff:ffff:ffff:ffff:ffff - 2,535,301,200,456,458,802,993,406,410,752137,438,953,472
2001::/282001::2001:000f:ffff:ffff:ffff:ffff:ffff:ffff - 1,267,650,600,228,229,401,496,703,205,37668,719,476,736
2001::/292001::2001:0007:ffff:ffff:ffff:ffff:ffff:ffff - 633,825,300,114,114,700,748,351,602,68834,359,738,368
2001::/302001::2001:0003:ffff:ffff:ffff:ffff:ffff:ffff - 316,912,650,057,057,350,374,175,801,34417,179,869,184
2001::/312001::2001:0001:ffff:ffff:ffff:ffff:ffff:ffff - 158,456,325,028,528,675,187,087,900,6728,589,934,592
2001:db8::/322001:db8::2001:db8:ffff:ffff:ffff:ffff:ffff:ffff - 79,228,162,514,264,337,593,543,950,3364,294,967,296
2001:db8::/332001:db8::2001:db8:7fff:ffff:ffff:ffff:ffff:ffff - 39,614,081,257,132,168,796,771,975,1682,147,483,648
2001:db8::/342001:db8::2001:db8:3fff:ffff:ffff:ffff:ffff:ffff - 19,807,040,628,566,084,398,385,987,5841,073,741,824
2001:db8::/352001:db8::2001:db8:1fff:ffff:ffff:ffff:ffff:ffff - 9,903,520,314,283,042,199,192,993,792536,870,912
2001:db8::/362001:db8::2001:db8:0fff:ffff:ffff:ffff:ffff:ffff - 4,951,760,157,141,521,099,596,496,896268,435,456
2001:db8::/372001:db8::2001:db8:07ff:ffff:ffff:ffff:ffff:ffff - 2,475,880,078,570,760,549,798,248,448134,217,728
2001:db8::/382001:db8::2001:db8:03ff:ffff:ffff:ffff:ffff:ffff - 1,237,940,039,285,380,274,899,124,22467,108,874
2001:db8::/392001:db8::2001:db8:01ff:ffff:ffff:ffff:ffff:ffff - 618,970,019,642,690,137,449,562,11235,554,432
2001:db8::/402001:db8::2001:db8:00ff:ffff:ffff:ffff:ffff:ffff - 309,485,009,821,345,068,724,781,05616,777,216
2001:db8::/412001:db8::2001:db8:007f:ffff:ffff:ffff:ffff:ffff - 154,742,504,910,672,534,362,390,5288,388,608
2001:db8::/422001:db8::2001:db8:003f:ffff:ffff:ffff:ffff:ffff - 77,371,252,455,336,267,181,195,2644,194,304
2001:db8::/432001:db8::2001:db8:001f:ffff:ffff:ffff:ffff:ffff - 38,685,626,227,668,133,590,597,6322,097,152
2001:db8::/442001:db8::2001:db8:000f:ffff:ffff:ffff:ffff:ffff - 19,342,813,113,834,066,795,298,8161,048,576
2001:db8::/452001:db8::2001:db8:0007:ffff:ffff:ffff:ffff:ffff - 9,671,406,556,917,033,397,649,408524,288
2001:db8::/462001:db8::2001:db8:0003:ffff:ffff:ffff:ffff:ffff - 4,835,703,278,458,516,698,824,704262,144
2001:db8::/472001:db8::2001:db8:0001:ffff:ffff:ffff:ffff:ffff - 2,417,851,639,229,258,349,412,352131,072
2001:db8::/482001:db8::2001:db8:0000:ffff:ffff:ffff:ffff:ffff - 1,208,925,819,614,629,174,706,17665,536
2001:db8::/492001:db8::2001:db8:0000:7fff:ffff:ffff:ffff:ffff - 604,462,909,807,314,587,353,08832,768
2001:db8::/502001:db8::2001:db8:0000:3fff:ffff:ffff:ffff:ffff - 302,231,454,903,657,293,676,54416,384
2001:db8::/512001:db8::2001:db8:0000:1fff:ffff:ffff:ffff:ffff - 151,115,727,451,828,646,838,2728,192
2001:db8::/522001:db8::2001:db8:0000:0fff:ffff:ffff:ffff:ffff - 75,557,863,725,914,323,419,1364,096
2001:db8::/532001:db8::2001:db8:0000:07ff:ffff:ffff:ffff:ffff - 37,778,931,862,957,161,709,5682,048
2001:db8::/542001:db8::2001:db8:0000:03ff:ffff:ffff:ffff:ffff - 18,889,465,931,478,580,854,7841,024
2001:db8::/552001:db8::2001:db8:0000:01ff:ffff:ffff:ffff:ffff - 9,444,732,965,739,290,427,392512
2001:db8::/562001:db8::2001:db8:0000:00ff:ffff:ffff:ffff:ffff - 4,722,366,482,869,645,213,696256
2001:db8::/572001:db8::2001:db8:0000:007f:ffff:ffff:ffff:ffff - 2,361,183,241,434,822,606,848128
2001:db8::/582001:db8::2001:db8:0000:003f:ffff:ffff:ffff:ffff - 1,180,591,620,717,411,303,42464
2001:db8::/592001:db8::2001:db8:0000:001f:ffff:ffff:ffff:ffff - 590,295,810,358,705,651,71232
2001:db8::/602001:db8::2001:db8:0000:000f:ffff:ffff:ffff:ffff - 295,147,905,179,352,825,85616
2001:db8::/612001:db8::2001:db8:0000:0007:ffff:ffff:ffff:ffff - 147,573,952,589,676,412,9288
2001:db8::/622001:db8::2001:db8:0000:0003:ffff:ffff:ffff:ffff - 73,786,976,294,838,206,4644
2001:db8::/632001:db8::2001:db8:0000:0001:ffff:ffff:ffff:ffff - 36,893,488,147,419,103,2322
2001:db8::/642001:db8::2001:db8:0000:0000:ffff:ffff:ffff:ffff - 18,446,744,073,709,551,6161
2001:db8::/652001:db8::2001:db8:0000:0000:7fff:ffff:ffff:ffff - 9,223,372,036,854,775,808 -
2001:db8::/662001:db8::2001:db8:0000:0000:3fff:ffff:ffff:ffff - 4,611,686,018,427,387,904-
2001:db8::/672001:db8::2001:db8:0000:0000:1fff:ffff:ffff:ffff - 2,305,843,009,213,693,952-
2001:db8::/682001:db8::2001:db8:0000:0000:0fff:ffff:ffff:ffff - 1,152,921,504,606,846,976-
2001:db8::/692001:db8::2001:db8:0000:0000:07ff:ffff:ffff:ffff - 576,460,752,303,423,488-
2001:db8::/702001:db8::2001:db8:0000:0000:03ff:ffff:ffff:ffff - 288,230,376,151,711,744-
2001:db8::/712001:db8::2001:db8:0000:0000:01ff:ffff:ffff:ffff - 144,115,188,075,855,872-
2001:db8::/722001:db8::2001:db8:0000:0000:00ff:ffff:ffff:ffff - 72,057,594,037,927,936-
2001:db8::/732001:db8::2001:db8:0000:0000:007f:ffff:ffff:ffff - 36,028,797,018,963,968-
2001:db8::/742001:db8::2001:db8:0000:0000:003f:ffff:ffff:ffff - 18,014,398,509,481,984-
2001:db8::/752001:db8::2001:db8:0000:0000:001f:ffff:ffff:ffff - 9,007,199,254,740,992-
2001:db8::/762001:db8::2001:db8:0000:0000:000f:ffff:ffff:ffff - 4,503,599,627,370,496-
2001:db8::/772001:db8::2001:db8:0000:0000:0007:ffff:ffff:ffff - 2,251,799,813,685,248-
2001:db8::/782001:db8::2001:db8:0000:0000:0003:ffff:ffff:ffff - 1,125,899,906,842,624-
2001:db8::/792001:db8::2001:db8:0000:0000:0001:ffff:ffff:ffff - 562,949,953,421,312-
2001:db8::/802001:db8::2001:db8:0000:0000:0000:ffff:ffff:ffff - 281,474,976,710,656-
2001:db8::/812001:db8::2001:db8:0000:0000:0000:7fff:ffff:ffff - 140,737,488,355,328-
2001:db8::/822001:db8::2001:db8:0000:0000:0000:3fff:ffff:ffff - 70,368,744,177,664-
2001:db8::/832001:db8::2001:db8:0000:0000:0000:1fff:ffff:ffff - 35,184,372,088,832-
2001:db8::/842001:db8::2001:db8:0000:0000:0000:0fff:ffff:ffff - 17,592,186,044,416-
2001:db8::/852001:db8::2001:db8:0000:0000:0000:07ff:ffff:ffff - 8,796,093,022,208-
2001:db8::/862001:db8::2001:db8:0000:0000:0000:03ff:ffff:ffff - 4,398,046,511,104-
2001:db8::/872001:db8::2001:db8:0000:0000:0000:01ff:ffff:ffff - 2,199,023,255,552-
2001:db8::/882001:db8::2001:db8:0000:0000:0000:00ff:ffff:ffff - 1,099,511,627,776-
2001:db8::/892001:db8::2001:db8:0000:0000:0000:007f:ffff:ffff - 549,755,813,888-
2001:db8::/902001:dbi::2001:db8:0000:0000:0000:003f:ffff:ffff - 274,877,906,944-
2001:db8::/912001:db8::2001:db8:0000:0000:0000:001f:ffff:ffff - 137,438,953,472-
2001:db8::/922001:db8::2001:db8:0000:0000:0000:000f:ffff:ffff - 68,719,476,736-
2001:db8::/932001:db8::2001:db8:0000:0000:0000:0007:ffff:ffff - 34,359,738,368-
2001:db8::/942001:db8::2001:db8:0000:0000:0000:0003:ffff:ffff - 17,179,869,184-
2001:db8::/952001:db8::2001:db8:0000:0000:0000:0001:ffff:ffff - 8,589,934,592-
2001:db8::/962001:db8::2001:db8:0000:0000:0000:0000:ffff:ffff - 4,294,967,296-
2001:db8::/972001:db8::2001:db8:0000:0000:0000:0000:7fff:ffff - 2,147,483,648-
2001:db8::/982001:db8::2001:db8:0000:0000:0000:0000:3fff:ffff - 1,073,741,824-
2001:db8::/992001:db8::2001:db8:0000:0000:0000:0000:1fff:ffff - 536,870,912-
2001:db8::/1002001:db8::2001:db8:0000:0000:0000:0000:0fff:ffff - 268,435,456-
2001:db8::/1012001:db8::2001:db8:0000:0000:0000:0000:07ff:ffff - 134,217,728-
2001:db8::/1022001:db8::2001:db8:0000:0000:0000:0000:03ff:ffff - 67,108,864-
2001:db8::/1032001:db8::2001:db8:0000:0000:0000:0000:01ff:ffff - 33,554,432-
2001:db8::/1042001:db8::2001:db8:0000:0000:0000:0000:00ff:ffff - 16,777,216-
2001:db8::/1052001:db8::2001:db8:0000:0000:0000:0000:007f:ffff - 8,388,608-
2001:db8::/1062001:db8::2001:db8:0000:0000:0000:0000:003f:ffff - 4,194,304-
2001:db8::/1072001:db8::2001:db8:0000:0000:0000:0000:001f:ffff - 2,097,152-
2001:db8::/1082001:db8::2001:db8:0000:0000:0000:0000:000f:ffff - 1,048,576-
2001:db8::/1092001:db8::2001:db8:0000:0000:0000:0000:0007:ffff - 524,288-
2001:db8::/1102001:db8::2001:db8:0000:0000:0000:0000:0003:ffff - 262,144-
2001:db8::/1112001:db8::2001:db8:0000:0000:0000:0000:0001:ffff - 131,072-
2001:db8::/1122001:db8::2001:db8:0000:0000:0000:0000:0000:ffff - 65,536-
2001:db8::/1132001:db8::2001:db8:0000:0000:0000:0000:0000:7fff - 32,768-
2001:db8::/1142001:db8::2001:db8:0000:0000:0000:0000:0000:3fff - 16,384-
2001:db8::/1152001:db8::2001:db8:0000:0000:0000:0000:0000:1fff - 8,192-
2001:db8::/1162001:db8::2001:db8:0000:0000:0000:0000:0000:0fff - 4,096-
2001:db8::/1172001:db8::2001:db8:0000:0000:0000:0000:0000:07ff - 2,048-
2001:db8::/1182001:db8::2001:db8:0000:0000:0000:0000:0000:03ff - 1,024-
2001:db8::/1192001:db8::2001:db8:0000:0000:0000:0000:0000:01ff - 512-
2001:db8::/1202001:db8::2001:db8:0000:0000:0000:0000:0000:00ff - 256-
2001:db8::/1212001:db8::2001:db8:0000:0000:0000:0000:0000:007f - 128-
2001:db8::/1222001:db8::2001:db8:0000:0000:0000:0000:0000:003f - 64-
2001:db8::/1232001:db8::2001:db8:0000:0000:0000:0000:0000:001f - 32-
2001:db8::/1242001:db8::2001:db8:0000:0000:0000:0000:0000:000f - 16-
2001:db8::/1252001:db8::2001:db8:0000:0000:0000:0000:0000:0007 - 8-
2001:db8::/1262001:db8::2001:db8:0000:0000:0000:0000:0000:0003 - 4-
2001:db8::/1272001:db8::2001:db8:0000:0000:0000:0000:0000:0001 - 2-
2001:db8::/1282001:db8::2001:db8:: - 1-

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