Important .at Information : : :
.at - All nameservers entered in the template are checked using all the IP addresses indicated. If glue records have been entered, the IP address is used for the query instead of the host name. The following queries must return answers that are correct and AA-flagged (authoritative answer):

The entire set of nameserver host names must be returned after an NS query for the domain.
The IP addresses of the NS hosts must match the IP addresses of the template check.
No CNAME record is allowed for an NS host (it must have a direct A record).
No CNAME record is allowed for the zone name.
The Server of Authority (SOA) SOA record for the zones must be returned. The MNAME of the SOA record must match one of the template's MNAMEs. Otherwise, the host must pass the same tests as those stipulated for the name server check, while the MNAME must tally with the host name (hidden master).
If a glue record is required for the MNAME, the entered name servers must execute a proper address resolution. All entered name servers must return matching addresses. These addresses are used to check the hidden master name servers.
All entered name servers and hidden master name servers must be accessible via any address, UDP port 53, and via TPC port 53.

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