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IPv6 WHOIS Lookup: Find Who Owns an IPv6 Address

This free IPv6 WHOIS lookup shows who owns an IPv6 address. It asks the regional registry that manages the prefix and returns the network name, range, country, dates and public contacts.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is an IPv6 WHOIS Lookup?

An IPv6 WHOIS lookup shows who owns an IPv6 address block. Like IPv4, every public IPv6 prefix is assigned by a regional internet registry to a provider or organisation. The record names the owner, the size of the block and how to reach them about problems.

Because IPv6 blocks are huge, the record you see is often a large prefix such as a /32 that belongs to a provider. Customers then receive smaller pieces, such as a /48 or /64, from inside it.

How to Use This IPv6 WHOIS Lookup

  1. Enter an IPv6 address in compressed or full form, such as 2001:4860:4860::8888.
  2. Press Lookup WHOIS.
  3. Read the network name, prefix, country and dates in the first table.
  4. Use the contacts table for abuse and technical reports.

If you only have an IPv4 address, use the IPv4 owner lookup instead.

Typical IPv6 Block Sizes

PrefixUsually held bySize
/32An internet provider or a large company65,536 /48 networks
/48A customer site, such as an office65,536 /64 networks
/56A home or small business connection256 /64 networks
/64One network segment18.4 quintillion addresses

The addressing rules are described in RFC 9083, the RDAP response format used here for the data, and the registry holds one record per assigned block.

Things to Know About the Results

  • Private ranges have no owner. Unique local addresses starting with fc or fd, and the documentation range 2001:db8::/32, are not public.
  • The owner is a block, not a person. You see the organisation, not an individual user.
  • Country can mislead. It shows where the block was registered, and global providers can use it anywhere.
  • Contacts may be limited. Registries hide personal data to follow privacy laws.

Convert a long address to its compact form with the IPv6 shortening tool before sharing it, find its hostname with the reverse DNS lookup, and test whether your own domain is ready for IPv6 with the IPv6 readiness test.

When to Use an IPv6 WHOIS Lookup

Use an IPv6 WHOIS lookup when a log shows an unfamiliar IPv6 address, when you need the abuse contact of a network or when you want to confirm that a prefix really belongs to your provider. Because IPv6 users often get a whole /64 or /56 to themselves, many requests from one prefix can come from a single household, so block carefully. Compare the result with the reverse DNS name to learn even more about the connection.

It is also handy when you plan address space: check that a prefix you were given is registered to you and that its dates and status look correct. Registries update records only when owners ask, so older data can be stale.

Frequently Asked Questions

The data is the same kind, but IPv6 networks are much larger. Providers usually receive a /32 or bigger, and customers receive /48 or /64 blocks inside it.
It is the block of addresses registered to the network. For example, 2001:4860::/32 covers every address that starts with 2001:4860.
Yes. You can enter the compressed form, such as 2001:db8::1, or the full form. Both are accepted.
Private ranges, such as fc00::/7, and documentation ranges, such as 2001:db8::/32, have no public owner record.

Disclaimer: results come from live requests and can change as records and servers change. We cannot guarantee that every answer matches what every visitor sees.