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.
documentation2001:db8:abcd::a5:0/112
network2001:db8:abcd::a5:0/112
first host2001:db8:abcd::a5:0
last host2001:db8:abcd::a5:ffff
addresses2¹⁶ = 65,536
short form2001:db8:abcd::a5:0
ipcalc 2001:db8:abcd::a5:0/112
address2001:0db8:abcd:0000:0000:0000:00a5:0000
network2001:0db8:abcd:0000:0000:0000:00a5:0000
last host2001:0db8:abcd:0000:0000:0000:00a5:ffff
green = network digits, amber = digit split by the prefix
full form2001:0db8:abcd:0000:0000:0000:00a5:0000
reverse dns0.0.0.0.5.a.0.0.0.0.0.0.0.0.0.0.0.0.0.0.d.c.b.a.8.b.d.0.1.0.0.2.ip6.arpa
/112 split into /128 · 65,536 subnets
close ×showing 256 of 65,536
01 / table
IPv6 prefix table.
Click a prefix longer than your network to split it into subnets.
| prefix | addresses | /64 subnets | in your /112 |
|---|---|---|---|
| /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 | - | 1 |
| /120 | 256 | - | 256 split → |
| /124 | 16 | - | 4,096 split → |
| /126 | 4 | - | 16,384 split → |
| /127 | 2 | - | 32,768 split → |
| /128 | 1 | - | 65,536 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?
▼
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.