IPv6 is a complete and different animal as far as subnetting goes. Please note the yellow rows as
each has special common use or notes. If there is nothing in the "Amount of a /64" column that means
it is to miniscule or to massive to justify calculation. Not much is the same with IPv6 compared to IPv4.
Route aggregation and purpose drive subnetting is something which every enterprise IPv6 deployment will make
use of, or it will fail miserably.
| Subnet | Addresses | Amount of a /64 |
|---|
| /128 | 1 | |
|---|
| /127 | 2 | |
|---|
| /126 | 4 | |
|---|
| /125 | 8 | |
|---|
| /124 | 16 | |
|---|
| /123 | 32 | |
|---|
| /122 | 64 | |
|---|
| /121 | 128 | |
|---|
| /120 | 256 | |
|---|
| /119 | 512 | |
|---|
| /118 | 1,024 | |
|---|
| /117 | 2,048 | |
|---|
| /116 | 4,096 | |
|---|
| /115 | 8,192 | |
|---|
| /114 | 16,384 | |
|---|
| /113 | 32,768 | |
|---|
| /112 | 65,536 | |
|---|
| /111 | 131,072 | |
|---|
| /110 | 262,144 | |
|---|
| /109 | 524,288 | |
|---|
| /108 | 1,048,576 | |
|---|
| /107 | 2,097,152 | |
|---|
| /106 | 4,194,304 | |
|---|
| /105 | 8,388,608 | |
|---|
| /104 | 16,777,216 | This is equivalent to an IPv4 Internet or IPv4 /8 |
|---|
| /103 | 33,554,432 | |
|---|
| /102 | 67,108,864 | |
|---|
| /101 | 134,217,728 | |
|---|
| /100 | 268,435,456 | |
|---|
| /99 | 536,870,912 | |
|---|
| /98 | 1,073,741,824 | |
|---|
| /97 | 2,147,483,648 | |
|---|
| /96 | 4,294,967,296 | |
|---|
| /95 | 8,589,934,592 | |
|---|
| /94 | 17,179,869,184 | |
|---|
| /93 | 34,359,738,368 | |
|---|
| /92 | 68,719,476,736 | |
|---|
| /91 | 137,438,953,472 | |
|---|
| /90 | 274,877,906,944 | |
|---|
| /89 | 549,755,813,888 | |
|---|
| /88 | 1,099,511,627,776 | |
|---|
| /87 | 2,199,023,255,552 | 1/8,388,608 |
|---|
| /86 | 4,398,046,511,104 | 1/4,194,304 |
|---|
| /85 | 8,796,093,022,208 | 1/2,097,152 |
|---|
| /84 | 17,592,186,044,416 | 1/1,048,576 |
|---|
| /83 | 35,184,372,088,832 | 1/524,288 |
|---|
| /82 | 70,368,744,177,664 | 1/262,144 |
|---|
| /81 | 140,737,488,355,328 | 1/131,072 |
|---|
| /80 | 281,474,976,710,656 | 1/65,536 |
|---|
| /79 | 562,949,953,421,312 | 1/32,768 |
|---|
| /78 | 1,125,899,906,842,620 | 1/16,384 |
|---|
| /77 | 2,251,799,813,685,240 | 1/8,192 |
|---|
| /76 | 4,503,599,627,370,490 | 1/4,096 |
|---|
| /75 | 9,007,199,254,740,990 | 1/2,048 |
|---|
| /74 | 18,014,398,509,481,900 | 1/1,024 |
|---|
| /73 | 36,028,797,018,963,900 | 1/512 |
|---|
| /72 | 72,057,594,037,927,900 | 1/256 |
|---|
| /71 | 144,115,188,075,855,000 | 1/128 |
|---|
| /70 | 288,230,376,151,711,000 | 1/64 |
|---|
| /69 | 576,460,752,303,423,000 | 1/32 |
|---|
| /68 | 1,152,921,504,606,840,000 | 1/16 |
|---|
| /67 | 2,305,843,009,213,690,000 | 1/8 |
|---|
| /66 | 4,611,686,018,427,380,000 | 1/4 |
|---|
| /65 | 9,223,372,036,854,770,000 | 1/2 |
|---|
| /64 | 18,446,744,073,709,500,000 | This is the standard end user allocation |
|---|
| /63 | 36,893,488,147,419,100,000 | 2 |
|---|
| /62 | 73,786,976,294,838,200,000 | 4 |
|---|
| /61 | 147,573,952,589,676,000,000 | 8 |
|---|
| /60 | 295,147,905,179,352,000,000 | 16 |
|---|
| /59 | 590,295,810,358,705,000,000 | 32 |
|---|
| /58 | 1,180,591,620,717,410,000,000 | 64 |
|---|
| /57 | 2,361,183,241,434,820,000,000 | 128 |
|---|
| /56 | 4,722,366,482,869,640,000,000 | 256 |
|---|
| /55 | 9,444,732,965,739,290,000,000 | 512 |
|---|
| /54 | 18,889,465,931,478,500,000,000 | 1,024 |
|---|
| /53 | 37,778,931,862,957,100,000,000 | 2,048 |
|---|
| /52 | 75,557,863,725,914,300,000,000 | 4,096 |
|---|
| /51 | 151,115,727,451,828,000,000,000 | 8,192 |
|---|
| /50 | 302,231,454,903,657,000,000,000 | 16,384 |
|---|
| /49 | 604,462,909,807,314,000,000,000 | 32,768 |
|---|
| /48 | 1,208,925,819,614,620,000,000,000 | 65,536 This is the standard business allocation |
|---|
| /47 | 2,417,851,639,229,250,000,000,000 | 131,072 |
|---|
| /46 | 4,835,703,278,458,510,000,000,000 | 262,144 |
|---|
| /45 | 9,671,406,556,917,030,000,000,000 | 524,288 |
|---|
| /44 | 19,342,813,113,834,000,000,000,000 | 1,048,576 |
|---|
| /43 | 38,685,626,227,668,100,000,000,000 | 2,097,152 |
|---|
| /42 | 77,371,252,455,336,200,000,000,000 | 4,194,304 |
|---|
| /41 | 154,742,504,910,672,000,000,000,000 | 8,388,608 |
|---|
| /40 | 309,485,009,821,345,000,000,000,000 | 16,777,216 |
|---|
| /39 | 618,970,019,642,690,000,000,000,000 | 33,554,432 |
|---|
| /38 | 1,237,940,039,285,380,000,000,000,000 | 67,108,864 |
|---|
| /37 | 2,475,880,078,570,760,000,000,000,000 | 134,217,728 |
|---|
| /36 | 4,951,760,157,141,520,000,000,000,000 | 268,435,456 |
|---|
| /35 | 9,903,520,314,283,040,000,000,000,000 | 536,870,912 |
|---|
| /34 | 19,807,040,628,566,000,000,000,000,000 | 1,073,741,824 |
|---|
| /33 | 39,614,081,257,132,100,000,000,000,000 | 2,147,483,648 |
|---|
| /32 | 79,228,162,514,264,300,000,000,000,000 | 4,294,967,296 This is the standard ISP Allocation |
|---|
| /31 | 158,456,325,028,528,000,000,000,000,000 | 8,589,934,592 |
|---|
| /30 | 316,912,650,057,057,000,000,000,000,000 | 17,179,869,184 |
|---|
| /29 | 633,825,300,114,114,000,000,000,000,000 | 34,359,738,368 |
|---|
| /28 | 1,267,650,600,228,220,000,000,000,000,000 | 68,719,476,736 |
|---|
| /27 | 2,535,301,200,456,450,000,000,000,000,000 | |
|---|
| /26 | 5,070,602,400,912,910,000,000,000,000,000 | |
|---|
| /25 | 10,141,204,801,825,800,000,000,000,000,000 | |
|---|
| /24 | 20,282,409,603,651,600,000,000,000,000,000 | |
|---|
| /23 | 40,564,819,207,303,300,000,000,000,000,000 | |
|---|
| /22 | 81,129,638,414,606,600,000,000,000,000,000 | |
|---|
| /21 | 162,259,276,829,213,000,000,000,000,000,000 | |
|---|
| /20 | 324,518,553,658,426,000,000,000,000,000,000 | |
|---|
| /19 | 649,037,107,316,853,000,000,000,000,000,000 | |
|---|
| /18 | 1,298,074,214,633,700,000,000,000,000,000,000 | |
|---|
| /17 | 2,596,148,429,267,410,000,000,000,000,000,000 | |
|---|
| /16 | 5,192,296,858,534,820,000,000,000,000,000,000 | |
|---|
| /15 | 10,384,593,717,069,600,000,000,000,000,000,000 | |
|---|
| /14 | 20,769,187,434,139,300,000,000,000,000,000,000 | |
|---|
| /13 | 41,538,374,868,278,600,000,000,000,000,000,000 | |
|---|
| /12 | 83,076,749,736,557,200,000,000,000,000,000,000 | |
|---|
| /11 | 166,153,499,473,114,000,000,000,000,000,000,000 | |
|---|
| /10 | 332,306,998,946,228,000,000,000,000,000,000,000 | |
|---|
| /9 | 664,613,997,892,457,000,000,000,000,000,000,000 | |
|---|
| /8 | 1,329,227,995,784,910,000,000,000,000,000,000,000 | |
|---|
