go
d.nic.at has one IP number , which also has a corresponding reverse pointer. at, or.at, co.at and ac.at use this as a nameserver. nic.at is a domain controlled by four nameservers at univie.ac.at. Two of them are on the same IP network. Incoming mail for nic.at is handled by two mailservers also at univie.ac.at. They are on the same IP network. nic.at has one IP number. d.nic.at is hosted on a server in Germany even though the hostname implies Austria.

d.nic.at
a records
 
+ 81.91.161.98 81.91.160.0/20 AS8763 -
+ --- -

nic.at
a records
 
+ 193.170.120.100 193.170.0.0/15 AS1853  
+ ---  
ns-soa records
ns4ext.univie.ac.at
+ 131.130.1.12 131.130.0.0/16 AS760 ns4.univie.ac.at
+ --- ns4.univie.ac.at
ns records
ns9.univie.ac.at
+ 194.0.10.100 194.0.10.0/24 AS49488 -
+ --- -
ns5.univie.ac.at
+ 193.171.255.77 193.170.0.0/15 AS1853 -
ns3ext.univie.ac.at
+ 131.130.1.11 131.130.0.0/16 AS760 ns3.univie.ac.at
+ --- ns3.univie.ac.at
ns4ext.univie.ac.at
+ 131.130.1.12 131.130.0.0/16 AS760 ns4.univie.ac.at
+ --- ns4.univie.ac.at
mx records
nicmx1.univie.ac.at
+ 131.130.3.106 131.130.0.0/16 AS760 oscar.univie.ac.at
+ --- oscar.univie.ac.at
nicmx2.univie.ac.at
+ 131.130.3.105 131.130.0.0/16 AS760 oliver.univie.ac.at
+ --- oliver.univie.ac.at
ip numbers of host
81.91.161.98
ptrs of ip numbers
d.nic.at
ip numbers using ptr to this host
81.91.161.98
domains using this as nameserver
ac.at
at
co.at
or.at