IPv6 Subnet Calculator
Enter an IPv6 address with a prefix to see its network, address range, number of /64 subnets, and its full and short forms. You can also split the prefix into smaller subnets.
/56 split into /127 · 2,361,183,241,434,822,606,848 subnets
close ×showing 256 of 2,361,183,241,434,822,606,848
IPv6 prefix table.
Click a prefix longer than your network to split it into subnets.
| prefix | addresses | /64 subnets | in your /56 |
|---|---|---|---|
| /8 | 2¹²⁰ | 2⁵⁶ | - |
| /12 | 2¹¹⁶ | 2⁵² | - |
| /16 | 2¹¹² | 2⁴⁸ | - |
| /20 | 2¹⁰⁸ | 2⁴⁴ | - |
| /24 | 2¹⁰⁴ | 2⁴⁰ | - |
| /28 | 2¹⁰⁰ | 2³⁶ | - |
| /32 | 2⁹⁶ | 4,294,967,296 | - |
| /36 | 2⁹² | 268,435,456 | - |
| /40 | 2⁸⁸ | 16,777,216 | - |
| /44 | 2⁸⁴ | 1,048,576 | - |
| /48 | 2⁸⁰ | 65,536 | - |
| /52 | 2⁷⁶ | 4,096 | - |
| /56 | 2⁷² | 256 | 1 |
| /60 | 2⁶⁸ | 16 | 16 split → |
| /64 | 2⁶⁴ | 1 | 256 split → |
| /72 | 2⁵⁶ | - | 65,536 split → |
| /80 | 2⁴⁸ | - | 16,777,216 split → |
| /96 | 4,294,967,296 | - | 2⁴⁰ split → |
| /112 | 65,536 | - | 2⁵⁶ split → |
| /120 | 256 | - | 2⁶⁴ split → |
| /124 | 16 | - | 2⁶⁸ split → |
| /126 | 4 | - | 2⁷⁰ split → |
| /127 | 2 | - | 2⁷¹ split → |
| /128 | 1 | - | 2⁷² split → |
About this calculator.
How do I use this IPv6 calculator?
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Type an IPv6 address followed by a prefix, like 2001:db8:abcd::1/48. Without a prefix it uses /64. The address can be written in full or shortened with ::.
Why does IPv6 have no broadcast address?
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IPv6 replaced broadcast with multicast, so no address is set aside for it. That is why this calculator shows the whole range, from the network address to the last address.
What prefix do ISPs usually hand out?
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A single LAN is almost always a /64. Home customers usually get a /56 or /60, and an organization or site usually gets a /48. One /48 holds 65,536 /64 subnets.