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.
No data is transmitted — everything runs locallyTool
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
Affiliate disclosure
Developer-friendly cloud infrastructure. DigitalOcean provides cloud compute, networking, and managed databases with predictable pricing.
IPv6-ready infrastructure on DigitalOcean
External site · Independent provider · We may receive a commission · Not a recommendation
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.
Related tools