AAAA record lookup
AAAA records map a hostname to an IPv6 address. They complement IPv4 A records but are not required for every service.
Enter a root domain or subdomain—no protocol or path needed.
When to publish AAAA records
Publish an AAAA record only when the destination can serve traffic correctly over IPv6. Clients commonly prefer IPv6 when it is available, so a broken IPv6 route can cause failures even while IPv4 works.
A domain may publish both A and AAAA records for dual-stack access, or only one address family when that is intentional.
Troubleshooting IPv6 DNS
- Confirm that the server or CDN accepts IPv6 traffic.
- Check that firewall rules allow the expected IPv6 ports.
- Verify the certificate covers the hostname.
- Remove stale AAAA records when the IPv6 destination no longer exists.
Quick answers
Frequently asked questions
What does AAAA mean?
AAAA is the DNS record type used for a 128-bit IPv6 address. It is sometimes called a “quad-A” record.
Does AAAA make a site more secure?
No. IPv6 support and security are separate concerns. TLS, firewall policy, patching, and correct routing still need to be configured.