>*.4.4.3.0.5.a.0.0.8.b.d.0.1.0.0.2.ip6.arpa. PTR a.node.on.vlan344.namn.se. > >...will work just fine, for instance. Since there is no AAAA record for a.node.on.vlan344.namn.se., this won't work fine in any rDNS check I'm aware of. You are aware that useful rDNS has to have matching forward DNs, right?