Something

named.conf

zone "3.b.5.7.0.0.4.0.8.1.6.0.1.0.0.2.ip6.arpa" IN {
        type master;
        file "pri/2001.618.400.75b3.zone";
        allow-update { none; };
        notify no;
};

zonefile...

$TTL 1H
@                       IN SOA       ns.the-cell.co.uk. hostmaster.the-cell.co.uk. (
                                        2006080302      ; Serial
                                        1200            ; Refresh
                                        180             ; Retry
                                        4W              ; Expire
                                        1H)             ; Minimum TTL


                        IN NS        ns.the-cell.co.uk.

1.2.9.0.0.0.0.0.0.0.0.0.0.0.0.0 IN PTR ipv6.lan.