Network Engineering
IPv6 Address Calculator
Enter an IPv6 address or prefix to expand it to full notation, classify as link-local, unique local, documentation, or global unicast, and calculate subnet information.
Calculations run locally in your browserTool
About this tool
IPv6 Address Calculator
The IPv6 Address Calculator expands compressed IPv6 notation, classifies address types, computes subnet information, and explains EUI-64 and privacy extension addressing.
• Expand an abbreviated IPv6 address for use in a configuration file
• Classify an IPv6 address from a log file before investigating
• Calculate the host count for an IPv6 /64 subnet
• Understand EUI-64 interface ID derivation and privacy extension implications
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FAQ
What does this tool tell you?
The IPv6 Address Calculator expands compressed IPv6 notation, classifies address types, computes subnet information, and explains EUI-64 and privacy extension addressing.
What affects the result most?
IPv6 expansion: 2001:db8::1 → 2001:0db8:0000:0000:0000:0000:0000:0001. Prefix/subnet: /48 per site (ISP allocation), /64 per subnet (required for SLAAC). Special addresses: ::1 (loopback), fe80::/10 (link-local), fc00::/7 (unique local), 2001:db8::/32 (documentation).
How should I use the result?
The calculation is deterministic — the same inputs always produce the same output — so the most useful workflow is to vary one input at a time and see which factor moves the result most. That tells you where to focus your attention before committing to a decision.
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