AAAA Record Lookup — Check a Domain’s IPv6 Addresses

What is an AAAA record?

An AAAA record maps a hostname to an IPv6 address. It is the IPv6 counterpart of the A record — the name has four As because an IPv6 address is four times the size of an IPv4 one. A domain with no AAAA record is unreachable from an IPv6-only client.

Fields in an AAAA record

Field	Meaning
Name	The hostname the record belongs to.
TTL	Seconds a resolver may cache this address before asking again.
Address	One IPv6 address, usually in compressed form such as `2606:4700::6810:85e5`.

How to read the results

Each row is one IPv6 address. An empty result is a normal, valid state — it simply means the host is IPv4-only. Compare with the A record lookup to see whether a name is dual-stack.

Rules worth knowing

AAAA holds IPv6 addresses only; the IPv4 equivalent is the A record.
Publishing an AAAA record commits you to actually serving traffic on that address — clients that prefer IPv6 will try it first.
The same CNAME restriction applies: a name with a CNAME cannot also carry an AAAA record.
Addresses may be written compressed (::) or in full; both refer to the same address.

Common problems

What you see	Usual cause
No records	The host is IPv4-only. This is common and not itself a fault.
The site is slow for some users	An AAAA record exists but the address does not answer. IPv6-preferring clients try it first and wait for a timeout before falling back.
NXDOMAIN	The name does not exist — check spelling and the subdomain.
Address looks different from what you configured	IPv6 addresses can be written compressed or expanded. Use the IP Address Validator to compare two forms of the same address.

Look up another record type

Each record type has its own page with the same explanation of its fields, or use the full DNS Lookup to query every common type at once.

A record MX record TXT record NS record CNAME record SOA record CAA record SRV record

Most often looked up alongside AAAA: A Record Lookup , CNAME Record Lookup , NS Record Lookup .

Data source: Public DNS-over-HTTPS resolvers. Queries go to the selected public resolver; results reflect that resolver’s cache. Learn about our data sources →

Frequently asked questions

Do I need an AAAA record?

Not strictly, but without one your site is unreachable from IPv6-only networks, which are increasingly common on mobile carriers. Most CDNs add one automatically.

What happens if I publish an AAAA record that does not work?

Clients that prefer IPv6 connect to it first, hang until the connection times out, then fall back to IPv4. The result is a site that feels intermittently slow — one of the harder problems to diagnose from the browser alone.

Can a domain have both A and AAAA records?

Yes, and that is the recommended setup. It is called dual-stack: IPv4 clients use the A record, IPv6 clients use the AAAA record.

Why is my IPv6 address shown differently here?

Resolvers return addresses in the compressed canonical form defined by RFC 5952, so leading zeros are dropped and the longest run of zero groups collapses to ::.