The Registrar prescribed 2 NS-servers:
Nserver: ns1.reselldns.de
Nserver: ns2.reselldns.de
\r
$ nslookup calendar.catusaar.de ns1.reselldns.de
Server: ns1.reselldns.de
Address: 212.123.35.78#53
\r
Name: calendar.catusaar.de
Address: 212.224.79.51
\r
$ nslookup calendar.catusaar.de ns2.reselldns.de
Server: ns2.reselldns.de
Address: 212.123.32.78#53
\r
Name: calendar.catusaar.de
Address: 212.224.79.51
\r
You're trying to edit the DNS records ns.catusaar.de (all 3 different NS IP), which is in no way responsible for Your area (or the Registrar does not know about this).
\r
nslookup calendar.catusaar.de ns.catusaar.de
Server: ns.catusaar.de
Address: 212.224.79.51#53
\r
calendar.catusaar.de canonical name = ghs.google.com.
\r
\r
Kick hoster — they namudrili.
\r
But the splash this thing all excellent — use 3rd year :)