go
mail.b-5.dk are subdomains to this hostname.

dk
a records
 
+ 193.163.102.23 193.163.102.0/24 AS39839  
+ ---  
ns-soa records
b.nic.dk
+ 193.163.102.222 193.163.102.0/24 AS39839 -
+ --- -
ns records
a.nic.dk
+ 212.88.78.122 212.88.64.0/19 AS9158 -
+ --- -
b.nic.dk
+ 193.163.102.222 193.163.102.0/24 AS39839 -
c.nic.dk
+ 198.173.5.4 198.173.5.0/24 AS14585 -
l.nic.dk
+ 192.38.7.242 192.38.0.0/17 AS1835 -
s.nic.dk
+ 77.72.229.252 77.72.224.0/21 AS8674 -
p.nic.dk
+ 204.61.216.36 204.61.216.0/23 AS42 -
subdomains
mail.b-5.dk