FREE · NO ACCOUNT REQUIRED

AAAA (IPv6) Record Lookup — check the IPv6 address a domain resolves to.

Query the AAAA (quad-A) record for any domain in real time. Returns every IPv6 address the domain publishes, the TTL, and the authoritative source. Cross-references against A records to give you an instant dual-stack view. Roughly 40% of global internet traffic is IPv6 as of 2025 — knowing whether your domain participates matters both for performance and for future-proofing.

01 · TRY IT

Look up an AAAA record

Authoritative query. Returns the IPv6 address list, TTL per record, and source nameserver.

02 · WHAT IT RETURNS

What the AAAA lookup shows

IPv6 address list (All records)

Every AAAA record for the domain. Empty answer set is common — it means the domain hasn't enabled IPv6 (or hasn't yet).

Per-record TTL (Cache lifetime)

Same TTL semantics as A records. Coordinate your A and AAAA TTLs so both propagate together.

A/AAAA parity check (Dual-stack)

Cross-references against the domain's A record — flags when IPv4 and IPv6 point at wildly different addresses (usually a CDN vs origin mismatch).

IPv6 brokenness detection (Happy Eyeballs risk)

If AAAA is published but unreachable, IPv6-first clients hit a timeout before falling back to IPv4 — slow-loading pages. Better to skip AAAA than to publish a broken one.

Address expansion (Full form)

Every returned address is shown in both compact (`2001:db8::1`) and expanded form for readability.

Provider fingerprint (Known ranges)

Common IPv6 ranges (Cloudflare, Fastly, AWS, Google) are labelled so you can identify the CDN or hosting provider at a glance.

03 · WHY IT MATTERS

When to check AAAA

  • IPv6 rollout verification You just enabled IPv6 at your CDN or DNS host — this tool confirms AAAA is actually published and resolving correctly.
  • IPv6 outage triage Site loading slowly for some users but fine for others? Broken AAAA is a classic cause — IPv6-first clients timeout before falling back to A.
  • CDN feature check Whether your CDN plan actually enables IPv6. Some plans publish AAAA by default; others require explicit opt-in.
  • Deprecation planning Some CDNs/services will start charging for IPv4-only over the next few years as ARIN pool exhaustion pressures grow. IPv6 readiness is future-proofing.
  • IPv6-only network testing If your monitoring or CI runs on IPv6-only infrastructure, missing AAAA means your target is unreachable from that environment.
04 · QUESTIONS

Common questions

  • What is an AAAA record? The IPv6 twin of an A record. Maps a domain to an IPv6 address. Called 'quad-A' because IPv6 addresses are 4× the length of IPv4 (128 bits vs 32).
  • Why doesn't my domain publish AAAA? Most likely your DNS host, hosting provider, or CDN hasn't enabled IPv6, or you haven't configured it manually. Cloudflare, Fastly, and CloudFront publish AAAA by default; self-hosted setups often need explicit config.
  • What's Happy Eyeballs? The algorithm modern browsers use to prefer IPv6 when available but fall back to IPv4 gracefully. Fast fallback (~300ms timeout) means users don't notice a broken IPv6 — unless the fallback itself is slow.
  • Can I have AAAA on a subdomain without A? Yes — it's IPv6-only. But then IPv4-only clients can't reach it, so it's rare in production. More common: A only on the apex, AAAA + A on `www`.
  • What does '::' mean in an IPv6 address? Shorthand for 'one or more all-zero groups'. `2001:db8::1` is `2001:0db8:0000:0000:0000:0000:0000:0001` fully expanded. Can only appear once per address.
05 · RELATED

Related DNS tools

A (IPv4) Lookup (IPv4 pair)

Confirm the IPv4 side of the dual-stack setup.

PTR / Reverse DNS (IPv6 aware)

Reverse-lookup any IPv6 address returned — hostname per address.

DNS Propagation (Global spread)

See AAAA propagation across regions.

DNS Query (All Records) (Super tool)

Full DNS dump including A + AAAA + MX + TXT + more.