IPv6 Subnet Calculator

Inspect IPv6 prefixes, first and last address, available addresses and /64 subnets.

Enter an IPv6 CIDR prefix to compute the network address in expanded and compressed forms, first and last host in the prefix, total addresses (exact or scientific-style display for very large prefixes), and how many /64 subnets fit when applicable.

CIDR notation

Boxis IPv6 prefix calculator with RFC-style compressed notation and precise BigInt math for large subnets; inputs stay private.

Why operational privacy matters for IP tools

Subnet planners, converters and credential generators often process sensitive operational data such as internal prefixes, addressing plans and authentication material.

These Boxis pages keep your inputs on the page: nothing is submitted to Boxis backend scripts or logged server-side, which lowers accidental disclosure compared with generic web forms.

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Frequently asked questions

Do these tools send data to Boxis?

No. Your inputs are used only to display results here; passwords, IP addresses, MAC addresses and timestamps are not uploaded to Boxis servers.

When do I need a server-side tool instead?

Use backend workflows when the answer depends on private inventories, live infrastructure state or authenticated customer records. Deterministic calculators work fully from the values you type.