Calculate IPv6 subnet details, expand and compress addresses, detect address types, and divide networks. Essential for network admins.
| 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 |
You might also find these calculators useful
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
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.
Identify 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.
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.
Remove leading zeros from each group and replace the longest sequence of all-zero groups with ::. For example, 2001:0db8:0000:0000:0000:0000:0000:0001 becomes 2001:db8::1.
Home networks typically receive a /56 or /48 prefix from their ISP. A /56 provides 256 /64 subnets, while a /48 provides 65,536 /64 subnets.
Link-local addresses (fe80::/10) are automatically assigned to every IPv6-enabled interface. They are only valid on the local network segment and are used for neighbor discovery and local communication.
IPv6 uses 128-bit addresses compared to IPv4s 32-bit addresses. This provides approximately 340 undecillion (3.4 x 10^38) addresses, enough for every atom on Earth to have multiple addresses.
For comprehensive network analysis including IPv6 visualization and additional subnet tools, visit NetYogi's Subnet Calculator. It offers advanced features for network planning and troubleshooting.