Here is a little shortcut to hopefully help you subnet IPv6.
/16 /32 /48 /64 /80 /96 /112
v v v v v v v
2001:aaaa:bbbb:cccc:dddd:eeee:ffff:1111
Prefix /48 count /56 count Number of /64 Subnets Number of Hosts
/64 1 18,446,744,073,709,551,616 (2^64) (quintillion) |
/63 2 36,893,488,147,419,103,232
/62 4 73,786,976,294,838,206,464
/61 8 147,573,952,589,676,412,928
/60 16 295,147,905,179,352,825,856
/59 32 590,295,810,358,705,651,712
/58 64 1,180,591,620,717,411,303,424 (sextillion)
/57 128 2,361,183,241,434,822,606,848
/56 1 256 4,722,366,482,869,645,213,696 (2^72) |
/55 2 512 9,444,732,965,739,290,427,392
/54 4 1,024 18,889,465,931,478,580,854,784
/53 8 2,048 37,778,931,862,957,161,709,568
/52 16 4,096 75,557,863,725,914,323,419,136
/51 32 8,192 151,115,727,451,828,646,838,272
/50 64 16,384 302,231,454,903,657,293,676,544
/49 128 32,768 604,462,909,807,314,587,353,088
/48 1 256 65,536 1,208,925,819,614,629,174,706,176 (2^80) (septillion) |
/47 2 512 131,072 2,417,851,639,229,258,349,412,352
/46 4 1,024 262,144 4,835,703,278,458,516,698,824,704
/45 8 2,048 524,288 9,671,406,556,917,033,397,649,408
/44 16 4,096 1,048,576 19,342,813,113,834,066,795,298,816
/43 32 8,192 2,097,152 38,685,626,227,668,133,590,597,632
/42 64 16,384 4,194,304 77,371,252,455,336,267,181,195,264
/41 128 32,768 8,388,608 154,742,504,910,672,534,362,390,528
/40 256 65,536 16,777,216 309,485,009,821,345,068,724,781,056
/39 512 131,072 33,554,432 618,970,019,642,690,137,449,562,112
/38 1,024 262,144 67,108,864 1,237,940,039,285,380,274,899,124,224 (octillion)
/37 2,048 524,288 134,217,728 2,475,880,078,570,760,549,798,248,448
/36 4,096 1,048,576 268,435,456 4,951,760,157,141,521,099,596,496,896
/35 8,192 2,097,152 536,870,912 9,903,520,314,283,042,199,192,993,792
/34 16,384 4,194,304 1,073,741,824 19,807,040,628,566,084,398,385,987,584
/33 32,768 8,388,608 2,147,483,648 39,614,081,257,132,168,796,771,975,168
/32 65,536 16,777,216 4,294,967,296 79,228,162,514,264,337,593,543,950,336 (2^96) |
/31 131,072 33,554,432 8,589,934,592 158,456,325,028,528,675,187,087,900,672
/30 262,144 67,108,864 17,179,869,184 316,912,650,057,057,350,374,175,801,344
/29 524,288 134,217,728 34,359,738,368 633,825,300,114,114,700,748,351,602,688
/28 1,048,576 268,435,456 68,719,476,736 1,267,650,600,228,229,401,496,703,205,376 (nonillion)
/27 2,097,152 536,870,912 137,438,953,472 2,535,301,200,456,458,802,993,406,410,752
/26 4,194,304 1,073,741,824 274,877,906,944 5,070,602,400,912,917,605,986,812,821,504
/25 8,388,608 2,147,483,648 549,755,813,888 10,141,204,801,825,835,211,973,625,643,008
/24 16,777,216 4,294,967,296 1,099,511,627,776 20,282,409,603,651,670,423,947,251,286,016
/23 33,554,432 8,589,934,592 2,199,023,255,552 40,564,819,207,303,340,847,894,502,572,032
/22 67,108,864 17,179,869,184 4,398,046,511,104 81,129,638,414,606,681,695,789,005,144,064
/21 134,217,728 34,359,738,368 8,796,093,022,208 162,259,276,829,213,363,391,578,010,288,128
/20 268,435,456 68,719,476,736 17,592,186,044,416 324,518,553,658,426,726,783,156,020,576,256
/19 536,870,912 137,438,953,472 35,184,372,088,832 649,037,107,316,853,453,566,312,041,152,512
/18 1,073,741,824 274,877,906,944 70,368,744,177,664 1,298,074,214,633,706,907,132,624,082,305,024 (decillion)
/17 2,147,483,648 549,755,813,888 140,737,488,355,328 2,596,148,429,267,413,814,265,248,164,610,048
/16 4,294,967,296 1,099,511,627,776 281,474,976,710,656 5,192,296,858,534,827,628,530,496,329,220,096
/15 8,589,934,592 2,199,023,255,552 562,949,953,421,312 1,038,459,371,706,965,525,706,099,265,844,0192
/14 17,179,869,184 4,398,046,511,104 1,125,899,906,842,624 207,691,874,341,393,105,141,219,853,168,80,384
/13 34,359,738,368 8,796,093,022,208 2,251,799,813,685,248 41,538,374,868,278,621,028,243,970,633,760,768
/12 68,719,476,736 17,592,186,044,416 4,503,599,627,370,496 83,076,749,736,557,242,056,487,941,267,521,536
/11 137,438,953,472 35,184,372,088,832 9,007,199,254,740,992 166,153,499,473,114,484,112,975,882,535,043,072
/10 274,877,906,944 70,368,744,177,664 18,014,398,509,481,984 332,306,998,946,228,968,225,951,765,070,086,144
/9 549,755,813,888 140,737,488,355,328 36,028,797,018,963,968 664,613,997,892,457,936,451,903,530,140,172,288
/8 1,099,511,627,776 281,474,976,710,656 72,057,594,037,927,936 1,329,227,995,784,915,872,903,807,060,280,344,576 (undecillion)
/7 2,199,023,255,552 562,949,953,421,312 144,115,188,075,855,872 2,658,455,991,569,831,745,807,614,120,560,689,152
/6 4,398,046,511,104 1,125,899,906,842,624 288,230,376,151,711,744 5,316,911,983,139,663,491,615,228,241,121,378,304
/5 8,796,093,022,208 2,251,799,813,685,248 576,460,752,303,423,488 10,633,823,966,279,326,983,230,456,482,242,756,608
/4 17,592,186,044,416 4,503,599,627,370,496 1,152,921,504,606,846,976 21,267,647,932,558,653,966,460,912,964,485,513,216
/3 35,184,372,088,832 9,007,199,254,740,992 2,305,843,009,213,693,952 42,535,295,865,117,307,932,921,825,928,971,026,432
/2 70,368,744,177,664 18,014,398,509,481,984 4,611,686,018,427,387,904 85,070,591,730,234,615,865,843,651,857,942,052,864
/1 140,737,488,355,328 36,028,797,018,963,968 9,223,372,036,854,775,808 170,141,183,460,469,231,731,687,303,715,884,105,728
/0 281,474,976,710,656 72,057,594,037,927,936 18,446,744,073,709,551,616 340,282,366,920,938,463,463,374,607,431,768,211,456
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