Compute IPv6 CIDR prefix ranges, expanded 128-bit addresses, and host capacities.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Type or paste your IPv6 address (compressed or uncompressed).
Choose prefix length (/32, /48, /56, /64, /128) with slider or presets.
Inspect fully expanded hex notation, network prefix, and address scope type.
A /64 prefix is the standard subnet size for IPv6 local area networks (LANs) and is required for SLAAC stateless auto-configuration.
A /64 subnet contains 2^64 addresses, which equals approximately 18.4 quintillion unique IP addresses.
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