AAAA Resource Record

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With an AAAA resource record ("quad-A") a DNS name is assigned an IPv6 address. This is the IPv6 equivalent of the A Resource Record .

The record type was originally introduced in 1995 in RFC 1886 . In 2000, RFC 2874 defined a new record type A6 , which should replace AAAA. However, in 2003 the IETF downgraded this standard to "experimental" and raised it again to the resource record type to be used with RFC 3596 AAAA.

According to RFC 3484 , dual-stack IPv6 / IPv4 implementations for name resolution always first ask for the AAAA resource record in order to revert to the A resource record if it does not exist.

construction

Name
published name
TTL
time to live : indicates how long in seconds this resource record may be valid in a cache (optional; if not specified, a previously explicitly defined default value is assumed - via a $ TTL statement at the beginning of the zone file )
IN
class: Internet (optional; alternatives are the classes HSfor HESIOD and CHfor CHAOS, two experimental network projects that have been obsolete for a long time; INassuming no information )
AAAA
Record Type
Adresse
the IPv6 address at which the searched server can be reached

example

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

Put equivalent: 

$TTL 3600
$ORIGIN example.com.
www    AAAA  2001:db8::1

Specifications

  • RFC 6724 Default Address Selection for Internet Protocol Version 6 (IPv6)
  • RFC 3596 DNS Extensions to Support IP Version 6