IPv6 subnets table
5 October 2021
The below table shows IPv6 prefixes (/32 and greater), including the number of bits used for the network portion and the number of IP addresses.
| Prefix | Bits | Number of host IPs |
|---|---|---|
| /128 | 0 | 1 |
| /124 | 4 | 16 |
| /120 | 8 | 256 |
| /116 | 12 | 4,096 |
| /112 | 16 | 65,536 |
| /108 | 20 | 1,048,576 |
| /104 | 24 | 16,777,216 |
| /100 | 28 | 268,435,456 |
| /96 | 32 | 4,294,967,296 |
| /92 | 36 | 68,719,476,736 |
| /88 | 40 | 1,099,511,627,776 |
| /84 | 44 | 17,592,186,044,416 |
| /80 | 48 | 281,474,976,710,656 |
| /76 | 52 | 4,503,599,627,370,496 |
| /72 | 56 | 72,057,594,037,927,936 |
| /68 | 60 | 1,152,921,504,606,846,976 |
| /64 | 64 | 18,446,744,073,709,551,616 |
| /60 | 68 | 295,147,905,179,352,825,856 |
| /56 | 72 | 4,722,366,482,869,645,213,696 |
| /52 | 76 | 75,557,863,725,914,323,419,136 |
| /48 | 80 | 1,208,925,819,614,629,174,706,176 |
| /44 | 84 | 19,342,813,113,834,066,795,298,816 |
| /40 | 88 | 309,485,009,821,345,068,724,781,056 |
| /36 | 92 | 4,951,760,157,141,521,099,596,496,896 |
| /32 | 96 | 79,228,162,514,264,337,593,543,950,336 |
Example
The most common IPv6 address is a /64 address. An IPv6 address has 128 bits, so a /64 prefix splits the IP address right down the middle. The first 64 bits are used for the network, and the last 64 bits are used for hosts.
Network | Nodes -------------------+------------------- 2001:0DB8:85A3:08D3:1319:8A2E:0370:7348/64
The smaller the prefix, the more nodes are available. For instance, a /56 address leave 72 bits for nodes:
Network | Nodes -----------------+--------------------- 2001:0DB8:85A3:08D3:1319:8A2E:0370:7348/56
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