• IPv6 Address Record (AAAA)
• Syntax AAAA RR

IPv6 Address Record (AAAA)
The current IETF recommendation is to use AAAA (Quad A) RR for forward
mapping and PTR RRs for reverse mapping when defining IPv6 networks. The
IPv6 AAAA RR is defined in RFC 3596. RFC 6563 plunged the dagger into the
heart of the short-lived and ill-fated A6 RR by moving it to historical
status. (Tech Stuff - IPv6 Protocol.) IPv6 Reverse Mapping is defined in
Chapter 3. IPv6 Address Calculator and reverse map generator.



	Syntax of AAAA RR
name ttl class rr ipv6
joe IN A 2001:db8::1

If multiple addresses are defined with the same name then BIND will respond
to queries with a list of the addresses but the order may change on
sucessive queries depending on the value of the rrset-order statement in
BIND's named.conf file. The default order is cyclic or round-robin. The
same
IP may be defined with different names. IP addresses do not have to be in
the same subnet or use the same global routing prefix. The order in which
AAAA RRs are defined is not significant but it may be easier to define them
in either an ascending or descending order of IP address since this can
prevent unintentional duplicate definitions. Since the ipv6 field is an
address not a name there is no terminating dot. The following zone file
fragment illustrates various uses of the AAAA RR.
	; zone fragment for example.com
$TTL 2d ; zone default = 2 days or 172800 seconds
$ORIGIN example.com.
....
joe IN AAAA 2001:db8::3 ; joe & www = same ip
www IN AAAA 2001:db8::3
; functionally the same as the record above
www.example.com. AAAA 2001:db8::3
fred 3600 IN AAAA 2001:db8::4 ; ttl =3600 overrides $TTL default
ftp IN AAAA 2001:db8::5 ; round robin with next
 IN AAAA 2001:db8::6
mail IN AAAA 2001:db8::7 ; mail = round robin
mail IN AAAA 2001:db8::32
mail IN AAAA 2001:db8::33
squat IN AAAA 2001:db8:0:0:1::13 ; address in another subnet

IPv6 and IPv4 RRs can be freely mixed in the zone file as shown the
following fragment:
	; zone fragment for example.com
$TTL 2d ; zone default = 2 days or 172800 seconds
$ORIGIN example.com.
....

www IN A 192.168.0.3
mail IN A 192.168.0.32
www IN AAAA 2001:db8::3
mail IN AAAA 2001:db8::32

Blank name substitution can also be used in mixed configurations if this is
more convenient or understandable:

	; zone fragment for example.com
$TTL 2d ; zone default = 2 days or 172800 seconds
$ORIGIN example.com.
....
www IN A 192.168.0.3
 IN AAAA 2001:db8::3
mail IN A 192.168.0.32
 IN AAAA 2001:db8::32

In both above fragments it is assumed that the hosts are running dual
(IPv4/IPv6) IP stacks.