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Help:Range blocks/IPv6 - MediaWiki

Help:Range blocks/IPv6

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See Help:Range blocks for the main page on rangeblocking, and for IPv4. Like IPv4, IPv6 rangeblocks are limited by $wgBlockCIDRLimit, which by default allows rangeblocks of up to /19 in size. Versions before MediaWiki 1.20wmf5 were supplied with a stricter limitation to /64.

Contents

Technical explanation[edit]

IPv6 addresses are each 128 bits long. Because each digit in an IPv6 address can have 16 different values (from 0 to 15), each digit represents the overall value of 4 bits (one nibble), with 32 digits total. As with IPv4, CIDR notation describes ranges in terms of a common prefix of bits. For example 2001:db8::/32 means that the range described has the first 32 bits set to the binary digits 00100000000000010000110110111000. Also like IPv4, MediaWiki implements IPv6 rangeblocks using CIDR notation.

Collateral damage[edit]

The best guideline for assessing collateral damage for an IPv6 rangeblock is to check the WHOIS, and the actual amount of activity from the range. MediaWiki's recent versions support looking up a range's contributions with Special:Contributions, e.g. Special:Contributions/2001:db8::/32 (note that the latter range will not return any edits).

A minimum /64 subnet for a connection is a practical requirement of IPv6. IPv6 requires minimum /64 subnetting as any deviation from this breaks a great number of IPv6 protocols; and it will also be needed for future developments. See IPv6 Unicast Address Assignment Considerations for a discussion on this topic. The only exception to smaller than /64 subnetting is for certain connections where many IPv6 features are not needed. For example inter-router linking may use this for limited uses; see Using 127-Bit IPv6 Prefixes on Inter-Router Links for a discussion on this. This is not relevant for IPv6 rangeblocking since no enduser will have addresses of this sort.

Like in IPv4, where a single static IPv4 address may supply a household or institution of some kind, a static IPv6 /64 range may also supply a household or institution, so multiple users can be affected by /64 rangeblocks.

Note that IPv6 /64 ranges are unlikely to be a dynamic, rather they are static, and do not change for an end-user. This is due to the large number of available IPv6 addresses, meaning dynamic allocation is unnecessary. An exception to this is the rising use of IPv6 for mobile broadband access; these IPs are allocated dynamically within certain ranges, and blocking these (whether IPv4 or IPv6) are unlikely to be successful, as they are easily circumvented and risk collateral damage.

How to calculate an IPv6 CIDR range[edit]

Although similar principles also apply to IPv4, the fact that hexadecimal digits correspond to exactly one nibble (4 bits) each simplifies the calculation somewhat.

  1. Find the common prefix - that is, the string of digits shared by all of your addresses.
  2. Expand the common prefix completely (including redundant zeros), and multiply the total number of digits by 4 - that's the size of your common prefix.
  3. Use the table below, and add the specified number to your prefix size (this is your CIDR suffix, the number of bits common to all addresses in the range). Append the specified digit to the common prefix you found above. Complete the group of four digits with zeros if necessary.
  4. The CIDR is then [common prefix (with additional digit as specified by table below, followed by zeros as necessary to keep the group of four digits complete)]/[common prefix length (plus 1,2, or 3 as specified by the table below)].

Prefix modification table[edit]

Example: If your prefix is 2001:db8:abcd:: (completely expanded to 2001:0db8:abcd::), and you have addresses like 2001:db8:abcd:9000:abe:: and 2001:db8:abcd:a000::, you'd use the entry saying that the digits after your prefix match 8-b, append 8 to the prefix, and add 2 to your common prefix's size. This would generate 2001:db8:abcd:8000::/50.

If digit after prefix only matches...Append this digit to your prefixAdd this to your common prefix length 0-f 0 0 0-7 0 1 8-f 8 0-3 0 2 4-7 4 8-b 8 c-f c 0-1 0 3 2-3 2 4-5 4 6-7 6 8-9 8 a-b a c-d c e-f e

Range table[edit]

The color-coding is approximate, and there will be overlaps.

CIDRStart of rangeEnd of rangeTotal addressesTotal /64 subnets ::/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 ::/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 ::/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 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 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::/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::/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::/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::/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::/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::/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::/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::/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::/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::/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::/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 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::/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::/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::/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::/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 2001:800::/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 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: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: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: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: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: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: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: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: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::/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::/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::/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::/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::/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::/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::/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::/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::/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::/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::/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::/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::/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::/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::/45 2001:db8:: 2001:db8:0007:ffff:ffff:ffff:ffff:ffff 9,671,406,556,917,033,397,649,408 524,288 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::/47 2001:db8:: 2001:db8:0001:ffff:ffff:ffff:ffff:ffff 2,417,851,639,229,258,349,412,352 131,072 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::/49 2001:db8:: 2001:db8:0000:7fff:ffff:ffff:ffff:ffff 604,462,909,807,314,587,353,088 32,768 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::/51 2001:db8:: 2001:db8:0000:1fff:ffff:ffff:ffff:ffff 151,115,727,451,828,646,838,272 8,192 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::/53 2001:db8:: 2001:db8:0000:07ff:ffff:ffff:ffff:ffff 37,778,931,862,957,161,709,568 2,048 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::/55 2001:db8:: 2001:db8:0000:01ff:ffff:ffff:ffff:ffff 9,444,732,965,739,290,427,392 512 2001:db8::/56 2001:db8:: 2001:db8:0000:00ff:ffff:ffff:ffff:ffff 4,722,366,482,869,645,213,696 256 2001:db8::/57 2001:db8:: 2001:db8:0000:007f:ffff:ffff:ffff:ffff 2,361,183,241,434,822,606,848 128 2001:db8::/58 2001:db8:: 2001:db8:0000:003f:ffff:ffff:ffff:ffff 1,180,591,620,717,411,303,424 64 2001:db8::/59 2001:db8:: 2001:db8:0000:001f:ffff:ffff:ffff:ffff 590,295,810,358,705,651,712 32 2001:db8::/60 2001:db8:: 2001:db8:0000:000f:ffff:ffff:ffff:ffff 295,147,905,179,352,825,856 16 2001:db8::/61 2001:db8:: 2001:db8:0000:0007:ffff:ffff:ffff:ffff 147,573,952,589,676,412,928 8 2001:db8::/62 2001:db8:: 2001:db8:0000:0003:ffff:ffff:ffff:ffff 73,786,976,294,838,206,464 4 2001:db8::/63 2001:db8:: 2001:db8:0000:0001:ffff:ffff:ffff:ffff 36,893,488,147,419,103,232 2 2001:db8::/64 2001:db8:: 2001:db8:0000:0000:ffff:ffff:ffff:ffff 18,446,744,073,709,551,616 1 2001:db8::/65 2001:db8:: 2001:db8:0000:0000:7fff:ffff:ffff:ffff 9,223,372,036,854,775,808 - 2001:db8::/66 2001:db8:: 2001:db8:0000:0000:3fff:ffff:ffff:ffff 4,611,686,018,427,387,904 2001:db8::/67 2001:db8:: 2001:db8:0000:0000:1fff:ffff:ffff:ffff 2,305,843,009,213,693,952 2001:db8::/68 2001:db8:: 2001:db8:0000:0000:0fff:ffff:ffff:ffff 1,152,921,504,606,846,976 2001:db8::/69 2001:db8:: 2001:db8:0000:0000:07ff:ffff:ffff:ffff 576,460,752,303,423,488 2001:db8::/70 2001:db8:: 2001:db8:0000:0000:03ff:ffff:ffff:ffff 288,230,376,151,711,744 2001:db8::/71 2001:db8:: 2001:db8:0000:0000:01ff:ffff:ffff:ffff 144,115,188,075,855,872 2001:db8::/72 2001:db8:: 2001:db8:0000:0000:00ff:ffff:ffff:ffff 72,057,594,037,927,936 2001:db8::/73 2001:db8:: 2001:db8:0000:0000:007f:ffff:ffff:ffff 36,028,797,018,963,968 2001:db8::/74 2001:db8:: 2001:db8:0000:0000:003f:ffff:ffff:ffff 18,014,398,509,481,984 2001:db8::/75 2001:db8:: 2001:db8:0000:0000:001f:ffff:ffff:ffff 9,007,199,254,740,992 2001:db8::/76 2001:db8:: 2001:db8:0000:0000:000f:ffff:ffff:ffff 4,503,599,627,370,496 2001:db8::/77 2001:db8:: 2001:db8:0000:0000:0007:ffff:ffff:ffff 2,251,799,813,685,248 2001:db8::/78 2001:db8:: 2001:db8:0000:0000:0003:ffff:ffff:ffff 1,125,899,906,842,624 2001:db8::/79 2001:db8:: 2001:db8:0000:0000:0001:ffff:ffff:ffff 562,949,953,421,312 2001:db8::/80 2001:db8:: 2001:db8:0000:0000:0000:ffff:ffff:ffff 281,474,976,710,656 2001:db8::/81 2001:db8:: 2001:db8:0000:0000:0000:7fff:ffff:ffff 140,737,488,355,328 2001:db8::/82 2001:db8:: 2001:db8:0000:0000:0000:3fff:ffff:ffff 70,368,744,177,664 2001:db8::/83 2001:db8:: 2001:db8:0000:0000:0000:1fff:ffff:ffff 35,184,372,088,832 2001:db8::/84 2001:db8:: 2001:db8:0000:0000:0000:0fff:ffff:ffff 17,592,186,044,416 2001:db8::/85 2001:db8:: 2001:db8:0000:0000:0000:07ff:ffff:ffff 8,796,093,022,208 2001:db8::/86 2001:db8:: 2001:db8:0000:0000:0000:03ff:ffff:ffff 4,398,046,511,104 2001:db8::/87 2001:db8:: 2001:db8:0000:0000:0000:01ff:ffff:ffff 2,199,023,255,552 2001:db8::/88 2001:db8:: 2001:db8:0000:0000:0000:00ff:ffff:ffff 1,099,511,627,776 2001:db8::/89 2001:db8:: 2001:db8:0000:0000:0000:007f:ffff:ffff 549,755,813,888 2001:db8::/90 2001:db8:: 2001:db8:0000:0000:0000:003f:ffff:ffff 274,877,906,944 2001:db8::/91 2001:db8:: 2001:db8:0000:0000:0000:001f:ffff:ffff 137,438,953,472 2001:db8::/92 2001:db8:: 2001:db8:0000:0000:0000:000f:ffff:ffff 68,719,476,736 2001:db8::/93 2001:db8:: 2001:db8:0000:0000:0000:0007:ffff:ffff 34,359,738,368 2001:db8::/94 2001:db8:: 2001:db8:0000:0000:0000:0003:ffff:ffff 17,179,869,184 2001:db8::/95 2001:db8:: 2001:db8:0000:0000:0000:0001:ffff:ffff 8,589,934,592 2001:db8::/96 2001:db8:: 2001:db8:0000:0000:0000:0000:ffff:ffff 4,294,967,296 2001:db8::/97 2001:db8:: 2001:db8:0000:0000:0000:0000:7fff:ffff 2,147,483,648 2001:db8::/98 2001:db8:: 2001:db8:0000:0000:0000:0000:3fff:ffff 1,073,741,824 2001:db8::/99 2001:db8:: 2001:db8:0000:0000:0000:0000:1fff:ffff 536,870,912 2001:db8::/100 2001:db8:: 2001:db8:0000:0000:0000:0000:0fff:ffff 268,435,456 2001:db8::/101 2001:db8:: 2001:db8:0000:0000:0000:0000:07ff:ffff 134,217,728 2001:db8::/102 2001:db8:: 2001:db8:0000:0000:0000:0000:03ff:ffff 67,108,864 2001:db8::/103 2001:db8:: 2001:db8:0000:0000:0000:0000:01ff:ffff 33,554,432 2001:db8::/104 2001:db8:: 2001:db8:0000:0000:0000:0000:00ff:ffff 16,777,216 2001:db8::/105 2001:db8:: 2001:db8:0000:0000:0000:0000:007f:ffff 8,388,608 2001:db8::/106 2001:db8:: 2001:db8:0000:0000:0000:0000:003f:ffff 4,194,304 2001:db8::/107 2001:db8:: 2001:db8:0000:0000:0000:0000:001f:ffff 2,097,152 2001:db8::/108 2001:db8:: 2001:db8:0000:0000:0000:0000:000f:ffff 1,048,576 2001:db8::/109 2001:db8:: 2001:db8:0000:0000:0000:0000:0007:ffff 524,288 2001:db8::/110 2001:db8:: 2001:db8:0000:0000:0000:0000:0003:ffff 262,144 2001:db8::/111 2001:db8:: 2001:db8:0000:0000:0000:0000:0001:ffff 131,072 2001:db8::/112 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:ffff 65,536 2001:db8::/113 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:7fff 32,768 2001:db8::/114 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:3fff 16,384 2001:db8::/115 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:1fff 8,192 2001:db8::/116 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:0fff 4,096 2001:db8::/117 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:07ff 2,048 2001:db8::/118 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:03ff 1,024 2001:db8::/119 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:01ff 512 2001:db8::/120 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:00ff 256 2001:db8::/121 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:007f 128 2001:db8::/122 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:003f 64 2001:db8::/123 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:001f 32 2001:db8::/124 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:000f 16 2001:db8::/125 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:0007 8 2001:db8::/126 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:0003 4 2001:db8::/127 2001:db8:: 2001:db8:0000:0000:0000:0000:0000:0001 2 2001:db8::/128 2001:db8:: 2001:db8:: 1 -

Keys

No organization would ever receive an allocation of this size Regional Internet Registry/very large organization/ISP allocation sizes ISP/large organization allocation sizes Organization allocation sizes End-user allocation sizes Sub-allocations for same enduser (Single address)

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