IPv6 Lookup — Address, Owner and Location
Paste any IPv6 address to see its full expanded form, the organisation that owns the block, its ASN, geolocation and reverse DNS name.
Who this is for: Engineers auditing IPv6 allocation, ownership and location for an address they were handed.
Reading an IPv6 address
IPv6 addresses are 128 bits written as eight groups of four hexadecimal digits. Two conventions shorten that: leading zeros in a group are dropped, and one run of zero groups is replaced with a double colon. Only one double colon is allowed per address, which is what makes the expansion unambiguous.
A lookup tool expands the address back to its full form and shows which segment of the range it came from. For example, addresses beginning 2001:db8 belong to documentation ranges, 2001:0000 is Teredo, and fc00::/7 covers unique local addresses — private, in the same spirit as IPv4's 10.0.0.0/8.
What a lookup tells you
The same categories as IPv4: the organisation the block is registered to, the netblock it belongs to, the ASN announcing it, and a geolocation estimate. On top of that, the size of the allocation matters — IPv6 blocks are handed out far larger than IPv4 ones, so a single allocation can cover an enormous number of addresses and one ISP's whole range may sit inside one registration.
Where IPv6 geolocation is weaker
Coverage is thinner than for IPv4. Registries record the allocation, not the deployed topology, and many networks route IPv6 differently from IPv4 — sometimes through a different city entirely. If an IPv6 lookup gives a surprising answer, that is often why. Treat country as a rough guide and city as a hint.
Why a site looks IPv4-only
If a domain has no AAAA record, no client will reach it over IPv6 — the site is simply not publishing IPv6 support. This is common on older infrastructure and on hosts that never enabled it. It is also why some connections silently fall back to IPv4 even on an IPv6-capable network.
The reverse situation matters more: if your device has IPv6 and the site does too, that traffic may bypass a proxy or tunnel that only handles IPv4. Checking both address families is the only way to know what a site actually sees.
Practical uses
- Debugging dual-stack problems. When a site loads for some users and not others, missing or broken AAAA records are a frequent cause.
- Verifying which address family a service is reached over, which is what decides whether your tunnel is involved at all.
- Checking whether an IPv6 address is public or unique-local, which changes how you treat it in firewall rules.
- Attribution: mapping an IPv6 address to its registering organisation, exactly as you would for IPv4.
Frequently asked questions
Can I look up an IPv6 address for free?
Yes. IPv6 registration data is public. Registry information, allocation records and reverse DNS are all queryable without an account.
Why does my IPv6 lookup show a different city than my IPv4 address?
Because IPv6 is often routed differently, and geolocation for IPv6 draws on sparser data. Country is reasonably reliable; city is an estimate.
How do I tell if an IPv6 address is private?
Unique local addresses start with fc00::/7 — in practice fd00:: in most home and office deployments. Link-local addresses start with fe80::. Neither is routable on the public internet.
What is the double colon in an IPv6 address?
It stands for one or more groups of zeros. Because it can appear only once, the address can always be expanded back to its full eight groups unambiguously.
Related tools
PureIP — free IP lookup and network diagnostics: IP location, WHOIS, reverse DNS, reputation, blacklists, AI service reachability and global ping.