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zapp.inwx.net has one IP number , which also has a corresponding reverse pointer. adnetworx.de and adnetworx.net point to the same IP. inwx.net is a domain controlled by three nameservers at inwx.de. All of them are on different IP networks. inwx.net has one IP number. zapp.inwx.net is hosted on a server in Germany.

zapp.inwx.net
a records
 
+ 217.70.142.72 217.70.128.0/20 AS15366 -
+ --- -

inwx.net
a records
 
+ 84.16.249.83 84.16.224.0/19 AS28753  
+ ---  
ns-soa records
ns.inwx.de
+ 217.70.142.66 217.70.128.0/20 AS15366 -
+ --- -
ns records
ns.inwx.de
+ 217.70.142.66 217.70.128.0/20 AS15366 -
+ --- -
ns2.inwx.de
+ 213.239.206.103 213.239.192.0/18 AS24940 -
ns3.inwx.de
+ 217.20.112.194 217.20.112.0/20 AS28753 -
ip numbers of host
217.70.142.72
ptrs of ip numbers
zapp.inwx.net
ip numbers using ptr to this host
217.13.199.172
217.70.142.72
217.70.142.73
hostnames sharing ip with a-records
adnetworx.de
adnetworx.net