AAAA record lookup: check IPv6 DNS records
TL;DR. The AAAA record maps a hostname to a 128-bit IPv6 address. Adding AAAA next to A is the canonical way to be reachable over IPv6.
How the AAAA record works
Modern resolvers query A and AAAA in parallel and prefer IPv6 when both succeed (Happy Eyeballs). A missing AAAA on a dual-stack site is silently slower for IPv6-only clients and increasingly important for mobile carriers. Checking your AAAA record across multiple global resolvers confirms IPv6 reachability is consistent everywhere, not just from your own network.
Example AAAA record
example.com. 3600 IN AAAA 2606:2800:220:1:248:1893:25c8:1946Check a AAAA record live
Run the multi-resolver probe → and confirm propagation of your AAAA record across 12 global resolvers in real time.
Reference
Spec: RFC 3596.
AAAA record FAQ
How do I check an AAAA record? →
Run a probe in dnsprobe and we resolve the AAAA record from 12 global resolvers at once, so you can confirm your IPv6 address is published and consistent worldwide.
Do I need an AAAA record? →
You need an AAAA record to be reachable over IPv6. With IPv6 adoption above 40% on many mobile networks, a dual-stack A + AAAA setup avoids slower fallback for IPv6-first clients.
Why does my site work without an AAAA record? →
Clients with both IPv4 and IPv6 fall back to the A record when no AAAA exists. The site still loads, but IPv6-only clients cannot reach it and dual-stack clients lose the Happy Eyeballs speed advantage.