A6? is a way of specifying IPv6 addresses in DNS. It is specified in RFC:2874 and is considered by some as being the "standard" way of adding IPv6 entries into the DNS, however many consider it far too complex and use AAAA? instead. See AAAAvsA6 for discussion.

Example

$ORIGIN X.EXAMPLE.

N A6 64 ::1234:5678:9ABC:DEF0 SN-1.IP6

SN-1.IP6 A6 48 0:0:0:1:: IP6

IP6 A6 48 0::0 CUST-X.IP6.A.NET.

IP6 A6 48 0::0 CUST-X.IP6.B.NET.

Compare AAAA?.

I tried setting this up at home - debian woody, bind9. I could do host -t A6 $domain fine, and host -t A6 $host.$domain worked too, although it returned the fragment for the host and the domain name as part of the record - not what its supposed to do. Glibc under debian woody doesn't appear to support it, and its listed as a bug as of June 15 2003, tagged 'wishlist'. Pity too, as A6 addressing makes a LOT of sense for dynamic IP.

I had

$ORIGIN element.tla. test 10 IN A6 0 2002:6to4:prefix::

$ORIGIN test.element.tla. helium 10 IN A6 0 ::1 test.element.tla.

which is how I interpreted the bind9 docs on setting up A6 addressing. If i'm doing this wrong let me know. -- DanielLawson

Some name servers (bind9?) support A6? -> AAAA? translations, can this be enabled?

I can find no mention of this. Bind9 supports A6 addresses in full, which are essentially identical to AAAA addresses, but thats not what I want

CategoryDns