IPv6 address calculator

Expand, compress and classify any IPv6 address — see the canonical form, the /64 prefix, the address type and the binary layout. Runs entirely in your browser.

Enter an IPv6 address (with :: shorthand; IPv4-mapped accepted)

Compressed (canonical)—

Fully expanded (8 groups)—

Address type—

/64 prefix—

Binary (per 16 bits)—

Computed locally in your browser — nothing is sent anywhere. · Try:

What this shows

Compressed — the canonical form, with the longest run of zero groups replaced by ::.
Expanded — all eight 16-bit groups, zero-padded.
Type — loopback, link-local, unique-local, global unicast, multicast, IPv4-mapped and so on.
/64 prefix — the subnet most networks are handed.

Read the background in IPv6 for beginners, or the resolution path in how DNS resolves.