Why is it called a Quad-A record?

An IPv6 address is 128 bits long—four times the size of a standard 32-bit IPv4 address (A record). Hence, four 'A' characters are used.

Should every modern website have an AAAA record?

Yes. Major mobile carriers and regional ISPs operate IPv6-dominant networks. Adding AAAA records improves mobile loading speeds by eliminating NAT64 translation layers.

How can I check if my domain resolves via IPv6?

Query the AAAA record using our online DNS Lookup tool or run 'dig AAAA example.com' from your command line.

Home/DNS Lookup/AAAA Record

A CNAME

DNS Resource Record Type

AAAA Record: IPv6 Address Record (Quad-A)

Maps a domain name to a 128-bit IPv6 address for modern next-generation internet routing.

Record Type

AAAA

Query Protocol

DNS Port 53

Standard / RFC

RFC 3596, Section 2.1

Recommended TTL

3600 seconds

Query Live AAAA Records

Query any domain name to inspect authoritative AAAA records, response latency, and TTL values.

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BIND Zone File Syntax

Standard BIND representation of this record in authoritative master zone files:

example.com. 3600 IN AAAA 2001:db8::1

Recommended TTL: 3600 seconds (1 hour) for stable configurations.

Common Configuration Pitfalls

Publishing an AAAA record when the web server's firewall blocks inbound IPv6 traffic, causing severe connection delays (Happy Eyeballs timeouts) for IPv6 clients.
Typing invalid IPv6 shorthand notation or duplicate colons.

How the AAAA Record Operates in DNS Resolution

The AAAA record (commonly pronounced 'Quad-A') is the IPv6 counterpart to the standard IPv4 A record. It maps a hostname to a 128-bit IPv6 address (such as 2606:2800:220:1:248:1893:25c8:1946). Running both A and AAAA records on the same domain creates a dual-stack setup, allowing IPv6-capable devices to bypass IPv4 carrier-grade NAT.