go
d.ns.se and se-dns-vip1-sn2.hy.skanova.net point to 81.228.8.16.

d.ns.se
a records
 
+ 81.228.8.16 81.224.0.0/12 AS3301 se-dns-vip1-sn2.hy.skanova.net
+ --- se-dns-vip1-sn2.hy.skanova.net

se-dns-vip1-sn2.hy.skanova.net
a records
 
+ 81.228.8.16 81.224.0.0/12 AS3301 -
+ --- -
ip numbers of host
81.228.8.16
ptrs of ip numbers
se-dns-vip1-sn2.hy.skanova.net
hostnames sharing ip with a-records
d.ns.se
se-dns-vip1-sn2.hy.skanova.net
domains using this as nameserver
se