go
kanet.karch.dk has one IP number , which also has a corresponding reverse pointer. karch.dk is a domain controlled by two nameservers on different IP networks. Incoming mail for karch.dk is handled by one mailserver at karch.dk themselves. karch.dk has one IP number. kanet.karch.dk is hosted on a server in Denmark.

kanet.karch.dk
a records
 
+ 130.226.7.30 130.226.0.0/16 AS1835 -
+ --- -

karch.dk
a records
 
+ 91.143.114.233 91.143.112.0/20 AS28717  
+ ---  
ns-soa records
ns-soa.darenet.dk
+ 130.226.1.4 130.226.0.0/16 AS1835 -
+ --- -
ns records
ns-soa.darenet.dk
+ 130.226.1.4 130.226.0.0/16 AS1835 -
+ --- -
mimer.snet.uvm.dk
+ 193.162.240.5 193.162.240.0/21 AS3292 -
mx records
mail.karch.dk
+ 130.226.7.2 130.226.0.0/16 AS1835 -
+ --- -
ip numbers of host
130.226.7.30
ptrs of ip numbers
kanet.karch.dk
ip numbers using ptr to this host
130.226.7.30