IPv6 Address Explainer

Expand, canonicalize, classify, and inspect an IPv6 address or prefix using exact local arithmetic.

No DNS or network access: this explains syntax and well-known address ranges only. A zone ID identifies a local interface scope and is preserved for display but excluded from all address and prefix mathematics.

IPv6 address, optionally followed by a zone ID and/or prefix length

Examples: ::1, fe80::abcd%eth0/64, ::ffff:192.0.2.128/96

Address explanation

RFC 5952 canonical

Classification

Prefix address count

Address forms

Expanded
Canonical
Prefix
Zone ID
Integer (hex)
Embedded IPv4

Prefix range

Network
Last address
Interface identifier
Solicited-node multicast

IPv6 has no broadcast address. “Last address” is the numerical end of the prefix, not a broadcast destination.