AAAA Record (Quad-Address Record)

In the Domain Name System, hostnames are mapped to IPv6 addresses by AAAA resource records, so-called quad-A records. For reverse lookup the IETF reserved the domain, where the name space is hierarchically divided by the 1-digit hexadecimal representation of nibble units (4 bits) of the IPv6 address.

As in IPv4, each host is represented in the DNS by two DNS records: an address record and a reverse mapping pointer record. For example, a host computer named derrick in zone has the Unique Local Address fdda:5cc1:23:4::1f. Its quad-A address record is  IN  AAAA  fdda:5cc1:23:4::1f

and its IPv6 pointer record is  IN  PTR

This pointer record may be defined in a number of zones, depending on the chain of delegation of authority in the zone

The DNS protocol is independent of its Transport Layer protocol. Queries and replies may be transmitted over IPv6 or IPv4 transports regardless of the address family of the data requested.

AAAA record fields
NAME Domain name
CLASS Internet (1)
TTL Time to live in seconds
RDLENGTH Length of RDATA field
RDATA 128-bit IPv6 address, network byte order
Related Articles