AAAA record

An AAAA record is a DNS record that maps a hostname to an IPv6 address.

Format
Domains & DNS
Updated
Updated
Glossary Domains & DNS
AAAA record Aliases: IPv6 address record, quad-A record.

Definition

An AAAA record is a DNS record that maps a hostname to an IPv6 address.

How it works

IPv6 addresses are 128 bits long — four times the size of an IPv4 address, which is where the four As come from. Most sites publish an A and an AAAA record side by side so visitors can connect over whichever protocol their network supports. Just make sure both addresses lead to the same place, or IPv6 visitors will see a different site than everyone else.

Example: An AAAA record can map www.example.com to 2001:db8::10.

Often confused: The name suggests four A records bundled together; it is actually a single record holding one IPv6 address.

Sources

Last reviewed 2026-07-19.