Shikanoko Networks (SKNK)

SKNK · IPv6 tools

IPv6 Subnet Calculator

Enter an allocation prefix length to see how many /64 networks it contains and how large the address space is. The calculation runs locally in your browser.

/

Enter 32–64. Common values are /48 (organisation), /56 (small delegation), and /64 (one LAN).

Calculation result

/64 networks

65,536

Total addresses

280

Shown exactly as a power of two so the value stays readable.

What this means: Organisation-scale planning: 65,536 standard /64 networks.

Formula: /64 networks = 2^(64 − prefix length). Use /64 for ordinary LANs and VLANs; /127 is a common exception for point-to-point router links.

How to use this IPv6 subnet calculator

Enter the prefix length assigned to you. For example, a /48 contains 65,536 /64s, letting you reserve separate networks for LANs, VLANs, and locations instead of sizing subnets around host counts as in IPv4.

Next: give the space a structure

The count is only the start. A consistent numbering scheme for region, environment, and network purpose keeps addresses legible during an incident.

Read the IPv6 subnetting guide →