The following lines were added to the zone files int.2a06.zone and ext.2a06.zone:

;
$ORIGIN 1.1.0.1.3.7.0.8.0.0.0.4.6.0.a.2.ip6.arpa.
@                   NS      hamgate.apana.org.au.
;

This is all that is required to delegate a sub-domain. Steve will have to add a zone file

To be able to answer the requests for reverse lookup to 2001:44b8:5135:7c07::/64 the following was done.