IPv6 Subnet Calculator
Expand, compress, and analyze IPv6 subnets with prefix information and address classification.
Enter an IPv6 address and prefix length (e.g. 2606:4700:4700::1111/48).
What is IPv6 Subnet Calculator?
An IPv6 subnet calculator expands and compresses addresses, shows prefix boundaries, and classifies address types so you can plan dual-stack networks accurately.
How it works
Enter an IPv6 address with optional prefix length. PacketWizard normalizes representation and reports prefix and classification details in your browser.
Common issues
Compression confusion
Only one '::' run of zeros is allowed. Use the calculator to expand then re-compress when comparing addresses from different systems.
Frequently asked questions
What prefix should I use for LAN segments?
Many designs use /64 for end-user subnets. Follow your addressing plan and ISP allocation; the calculator helps validate boundaries, not choose policy.
Related tools
Continue with these related PacketWizard tools for adjacent diagnostics.