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.
link-localfe80::dd:5b00/120
networkfe80::dd:5b00/120
first hostfe80::dd:5b00
last hostfe80::dd:5bff
addresses2⁸ = 256
short formfe80::dd:5b00
ipcalc fe80::dd:5b00/120
addressfe80:0000:0000:0000:0000:0000:00dd:5b00
networkfe80:0000:0000:0000:0000:0000:00dd:5b00
last hostfe80:0000:0000:0000:0000:0000:00dd:5bff
green = network digits, amber = digit split by the prefix
full formfe80:0000:0000:0000:0000:0000:00dd:5b00
reverse dns0.0.b.5.d.d.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa
/120 split into /128 · 256 subnets
close ×01 / table
IPv6 prefix table.
Click a prefix longer than your network to split it into subnets.
| prefix | addresses | /64 subnets | in your /120 |
|---|---|---|---|
| /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 | - |
| /60 | 2⁶⁸ | 16 | - |
| /64 | 2⁶⁴ | 1 | - |
| /72 | 2⁵⁶ | - | - |
| /80 | 2⁴⁸ | - | - |
| /96 | 4,294,967,296 | - | - |
| /112 | 65,536 | - | - |
| /120 | 256 | - | 1 |
| /124 | 16 | - | 16 split → |
| /126 | 4 | - | 64 split → |
| /127 | 2 | - | 128 split → |
| /128 | 1 | - | 256 split → |
02 / faq
About this calculator.
How do I use this IPv6 calculator?
▼
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?
▼
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.