You have probably seen the A record — the one that points your domain to a server’s address. But scroll through a DNS panel and you may spot its close cousin, the AAAA record, with that curious quadruple-A name. It does almost exactly the same job as an A record, with one important difference: it works with IPv6 addresses, the next-generation addressing system that is quietly future-proofing the internet.

This guide explains what an AAAA record is, why it has such an unusual name, the difference between IPv4 and IPv6 in plain terms, and why IPv6 matters at all. You will also learn how A and AAAA records work together, whether you actually need to set one up yourself, and how to add one if you do. It is simpler than the name suggests.

What an AAAA record is

An AAAA (quad-A) record is a DNS record that maps a domain name to an IPv6 address. It does exactly what an A record does — resolves a hostname like example.com to the numeric address of the server hosting it — except it points to a 128-bit IPv6 address rather than a 32-bit IPv4 one.

Functionally, that is the whole story: when a device that supports IPv6 wants to reach your site, it can look up your AAAA record, get the IPv6 address, and connect. The AAAA record is simply the IPv6 equivalent of the familiar A record, serving the same purpose for the newer addressing system.

So if you understand the A record, you already understand the AAAA record. The only real difference is the type of address it holds — and knowing that difference explains why both exist and how they work side by side.

Why the name “quad-A”

The unusual name has a logical origin. The A in A record stands for “Address,” and it maps to an IPv4 address, which is 32 bits long. IPv6 addresses, by contrast, are 128 bits — exactly four times the length of an IPv4 address.

To signify that this record handles the larger, four-times-bigger address, the record type was named with four A’s: AAAA, spoken as “quad-A.” It is a compact way of saying “the Address record, but for the much longer IPv6 addresses.”

So the name is not arbitrary — it directly reflects the size relationship between the two addressing systems. Once you know that IPv6 is four times the length of IPv4, the quad-A name becomes an easy, memorable shorthand.

IPv4 vs IPv6 in plain terms

IPv4 and IPv6 are two versions of the internet’s addressing system — the scheme that gives every connected device a unique numeric address. IPv4 addresses are the familiar dotted-number format (like 192.0.2.1) and are 32 bits long, which allows for roughly 4.3 billion unique addresses.

That sounded like plenty in the early days of the internet, but with billions of people and countless devices now online, the world is running out of available IPv4 addresses. IPv6 was created to solve this: using 128-bit addresses, it provides an almost unimaginably vast pool — enough to comfortably address every device for the foreseeable future.

IPv6 addresses look different too, written as longer strings of hexadecimal separated by colons rather than dots. For a domain owner, the key point is simply that IPv6 is the newer, far larger addressing system, and the AAAA record is how a domain participates in it.

Why IPv6 matters

The driving reason IPv6 exists is IPv4 exhaustion. Because the supply of IPv4 addresses is effectively depleted, the internet has been steadily adopting IPv6 to keep expanding. Supporting IPv6 through an AAAA record means your site is reachable by the growing number of networks and devices that use it.

There is also a future-proofing angle. As IPv6 adoption continues, having an AAAA record ensures your site remains accessible and performs well for IPv6-first networks, some of which reach IPv4-only sites less efficiently. It is a way of staying current with how the internet is evolving.

For most site owners this happens quietly in the background, but it is genuinely beneficial: an IPv6-ready site is more broadly and efficiently reachable. The AAAA record is a small piece of DNS with a big role in keeping the web scalable.

A and AAAA working together

A site does not have to choose between IPv4 and IPv6 — it can support both at once, an arrangement called dual-stack. In practice, that means having both an A record (pointing to your server’s IPv4 address) and an AAAA record (pointing to its IPv6 address) for the same domain.

With both records in place, a visitor’s device uses whichever protocol it supports: IPv6-capable networks follow the AAAA record, while IPv4 networks follow the A record. The visitor never notices; they simply reach your site by the best available route.

This dual-stack approach is the standard, recommended setup, because it maximises compatibility. You remain fully reachable by the entire internet — the vast installed base still on IPv4 and the growing world moving to IPv6 — with no downside to supporting both.

Do you need to set up an AAAA record?

For most website owners, the honest answer is that you rarely need to touch AAAA records yourself. Reputable hosting providers typically configure both A and AAAA records automatically when you set up your site on their servers, so IPv6 support is handled for you behind the scenes.

This is why many people never consciously deal with an AAAA record even though their site has one. Your host knows its own IPv6 addresses and sets the record up as part of provisioning, giving you dual-stack support without any manual work.

You would only need to add or edit an AAAA record manually in specific situations — such as pointing your domain to a server whose IPv6 address you must enter yourself, or configuring a custom setup. In those cases, the process is just like adding an A record, using the IPv6 address as the value.

How to add an AAAA record if you need to

If you do need to create an AAAA record, the steps mirror those for an A record. Log in to your DNS provider, open the DNS or zone editor, add a new record, and choose the type AAAA. Set the host (@ for the root domain, or a subdomain label) and enter your server’s IPv6 address as the value.

The only practical difference from an A record is the value format: instead of a dotted IPv4 address, you paste the longer, colon-separated IPv6 address exactly as your host provides it. As always with DNS, precision matters, so copy the address carefully to avoid errors.

Save the record and allow time for propagation. If you already have a matching A record, adding the AAAA gives you full dual-stack support. And if you would rather not manage this at all, choosing a host that configures IPv6 automatically means you can leave AAAA records to your provider entirely.

One reassuring point: adding an AAAA record cannot break your existing IPv4 setup. The two records operate independently, so visitors on IPv4 keep using your A record exactly as before, while IPv6-capable visitors gain a route through the new AAAA record. There is no downside to being dual-stacked, which is why it has become the standard, recommended configuration for modern sites.

FAQs

What is an AAAA record?

An AAAA (quad-A) record is a DNS record that maps a domain name to an IPv6 address. It works exactly like an A record — resolving a hostname to the numeric address of its server — but points to a 128-bit IPv6 address instead of a 32-bit IPv4 one. It is simply the IPv6 equivalent of the A record.

Why is it called a ‘quad-A’ record?

Because the A record maps to a 32-bit IPv4 address, and IPv6 addresses are 128 bits — four times as long. The record type was named with four A’s (AAAA, said “quad-A”) to signify it handles the four-times-larger IPv6 addresses. The name directly reflects the size relationship between IPv4 and IPv6.

What is the difference between an A record and an AAAA record?

They do the same job for different address types. An A record maps a domain to an IPv4 address (like 192.0.2.1), while an AAAA record maps it to an IPv6 address (a longer, colon-separated string). Sites often have both — called dual-stack — so visitors reach them over whichever protocol their network supports.

Why does IPv6 matter?

Because the world has effectively run out of IPv4 addresses, and IPv6 provides a vastly larger pool to keep the internet expanding. Supporting IPv6 via an AAAA record keeps your site reachable by the growing number of IPv6 networks and devices, and future-proofs it as adoption continues. It ensures broad, efficient accessibility.

Do I need to set up an AAAA record myself?

Usually not. Most reputable hosts configure A and AAAA records automatically when you set up your site, giving you IPv6 support without any manual work. You would only add one yourself in special cases, such as pointing to a server whose IPv6 address you must enter — in which case the process is just like adding an A record.

How do I add an AAAA record?

Log in to your DNS provider, open the DNS or zone editor, add a record of type AAAA, set the host (@ for the root or a subdomain label), and enter your server’s IPv6 address as the value — pasting the longer, colon-separated address exactly. Save and allow time for propagation. Alongside an A record, it provides full dual-stack support.

The bottom line

An AAAA record is the IPv6 equivalent of the A record: it maps your domain to a 128-bit IPv6 address, doing exactly what the A record does but for the internet’s newer, far larger addressing system. Its quad-A name reflects that IPv6 addresses are four times the length of IPv4 ones. IPv6 exists because the world has essentially exhausted the roughly 4.3 billion IPv4 addresses, and it provides an enormous pool that keeps the internet scalable and future-proof — which is why supporting it keeps your site broadly and efficiently reachable.

In practice, most sites run dual-stack, with both an A record (IPv4) and an AAAA record (IPv6), so every visitor connects over whichever protocol their network supports. The good news for owners is that reputable hosts usually configure AAAA records automatically, so you rarely need to touch them. If you do — pointing to a server whose IPv6 address you must enter — the process is identical to adding an A record, just with the longer address as the value. Either way, an IPv6-ready site is a more accessible, future-proof one.

When you are ready, you can start with Hostinger and use code PROTIPS for the reader discount. An AAAA (quad-A) record maps your domain to an IPv6 address — the IPv6 version of the A record. IPv6 solves IPv4 exhaustion; most hosts set AAAA up automatically for dual-stack reachability.