what does this mean Superfluous name server listed at parent: ns52.domaincontrol.com?

Solution 1:

The two error messages are both indications of the same misconfiguration. In the com. zone, you have two NS records pointing to ns51.domaincontrol.com. and ns52.domaincontrol.com.

Both respond to queries for the zone, however when either of those servers are queried for NS records for the zone, they only report ns51.domaincontrol.com.

The likely explanation is that you are simply missing one NS record in the zone itself, indicating that ns52.domaincontrol.com. is also NS for the zone.

One error message tells you that ns52.domaincontrol.com. is in glue, but not in the zone, the other tells you that the zone only has a single NS record. Adding one NS record with ns52.domaincontrol.com. would make both messages go away.

It also tells you "Too few IPv4 name servers", which I find ironical, because you have even fewer IPv6 name servers. It is btw. redundant because it already you only have one.

Solution 2:

It means that the parent name servers list ns51.domaincontrol.com and ns52.domaincontrol.com as the name servers for holidayniseko.com but that only ns51.domaincontrol.com is listed as a name server at the name servers themselves.

querying ns51.domaincontrol.com for the NS record for holidayniseko.com lists itself as a name server.

querying ns52.domaincontrol.com for the NS record for holidayniseko.com lists ns51.domaincontrol.com as a name server.

So again, ns51 and ns52 are listed as name servers at the parent name servers but only ns51 is listed as a name server at the name servers themselves.