Calculate IPv6 subnet information, expand and compress addresses, detect address types, and divide networks. Essential tool for network administrators working with IPv6.
| Prefix | Description | Typical Use |
|---|---|---|
| /128 | Single host (loopback) | Host route |
| /127 | Point-to-point link | Inter-router links |
| /64 | Standard subnet | LAN, SLAAC required |
| /56 | Small site | Residential (256 /64s) |
| /48 | Site allocation | Enterprise (65,536 /64s) |
| /32 | ISP allocation | Service provider |
| /16 | RIR allocation | Regional registry |
| /12 | Large allocation | Major registry block |
| Address | Name | Description |
|---|---|---|
| ::/128 | Unspecified | No address assigned |
| ::1/128 | Loopback | Localhost |
| fe80::/10 | Link-Local | Local network only |
| fc00::/7 | Unique Local | Private networks |
| ff00::/8 | Multicast | One-to-many |
| 2000::/3 | Global Unicast | Internet routable |
| 2001:db8::/32 | Documentation | Examples only |
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IPv6 is the next-generation Internet Protocol with 128-bit addresses providing virtually unlimited address space. Our IPv6 Subnet Calculator helps you analyze addresses, calculate subnets, and understand the structure of IPv6 networks.
IPv6 uses 128-bit addresses represented as eight groups of four hexadecimal digits (e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334). The vast address space (2^128 addresses) eliminates the need for NAT and enables direct connectivity for all devices.
IPv6 Address Space
Total Addresses = 2^128 approximately 340 undecillion addressesIdentify address types (global unicast, link-local, multicast, etc.) instantly.
Expand compressed addresses or compress expanded ones following RFC standards.
Calculate subnet ranges and divide networks into smaller subnets.
View the full 128-bit binary representation of any IPv6 address.
Plan IPv6 address allocation for enterprise networks and data centers.
Identify address types and verify subnet configurations.
Learn IPv6 addressing concepts with visual binary representations.
Configure IPv6 subnets for VPCs in AWS, Azure, or GCP.
The standard subnet size is /64, which allocates 64 bits for the network prefix and 64 bits for the interface identifier. This is required for SLAAC (Stateless Address Autoconfiguration) to work properly.