IPv6 Expander
Expand, compress and classify an IPv6 address, with prefix and embedded IPv4 support.
IPv6 Expander
Paste a compressed, expanded, prefixed or IPv4-mapped address. The page shows the full eight-group form, the canonical compressed form, the prefix, any zone index and what kind of address it is. Everything runs in the browser.
Result
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Data terakhir yang pernah kamu isi di tool ini, tersimpan hanya di device/browser ini.
Save what you type here, in this browser? Your work would go into this browser's local storage, so a refresh or a trip to another tool does not wipe it. You also get a short list of previous entries under the form, each one restorable with a click. Nothing is ever uploaded, and there is no account.
Being straight about the trade-off: anything kept there can be read by anyone who can use this browser profile, and by any script that later runs on this site. A tool page can hold a private key, a password or a signed token. Saving is convenient; it is not private.
About this tool
Paste an IPv6 address in any spelling and the page shows the full eight-group form, the canonical compressed form and what kind of address it is. Prefixes, zone indexes and embedded IPv4 addresses are understood, and everything is computed in the browser.
Questions
- Why does the compressed form sometimes keep a zero group?
- The canonical rules compress only the longest run of two or more zero groups. A single zero group is written as a plain 0, and on a tie the leftmost run is the one compressed, so the same address always has one canonical spelling.
- What is the difference between link-local, unique local and global?
- Link-local (fe80::/10) is for one link and is never routed. Unique local (fc00::/7) is the IPv6 equivalent of private space, routable inside an organisation but not on the public internet. Global unicast (2000::/3) is the public, routable range.
- What is an IPv4-mapped address?
- An address of the form ::ffff:a.b.c.d that carries an IPv4 address inside an IPv6 one. It appears on dual-stack sockets and in logs, and the expander recognises it so you are not left guessing why a dotted quad shows up in an IPv6 field.
- Does the zone index change the address?
- No. The part after % names a local interface, such as %eth0, and is not part of the 128 bits. It matters only to the host you are on, which is why it is shown separately and not included in the expanded or compressed forms.