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. A zone file was created in /var/cache/bind/pri:

; 
; Zone file for my subdomain from Steve ('7c07') -IPv6 reverse look-up - external view
;
$TTL 1d
@           IN SOA  oz6bl.dk. hostmaster.oz6bl.dk. (
                    2025010201 ; serial
                    6h         ; refresh
                    2h         ; retry
                    2d         ; expire
                    1h         ; negative caching TTL of 1 hour
                    )
                    NS      ns.oz6bl.dk.
                    NS      hamgate.apana.org.au.
                    NS      ns01.one.com.
                    NS      ns02.one.com.
$ORIGIN 7.0.c.7.5.3.1.5.8.b.4.4.1.0.0.2.ip6.arpa.
;
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 IN PTR     nounours.oz6bl.dk.
2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 IN PTR     langben.oz6bl.dk.
5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 IN PTR     mail.oz6bl.dk.
5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 IN PTR     www.oz6bl.dk.
d.6.b.8.5.8.e.f.f.f.e.2.1.0.2.0 IN PTR     mail.oz6bl.dk.