An AAAA record maps a hostname to an IPv6 address. It enables IPv6 connectivity and is commonly published alongside A records for dual‑stack deployments.
Modern clients often try IPv6 first. If your IPv6 path is broken, users may see delays or intermittent failures. Use the AAAA record check tool to verify the published IPv6 address and compare it with your A record lookup results.
Run the lookup and confirm the address matches your host. If you are testing propagation, compare resolvers via the DNS propagation check.
Pair AAAA with A records for IPv4, and use CNAME for aliases when pointing to managed services.