go
dns-ro.denic.de has one IP number , which also has a corresponding reverse pointer. ro and popoiu.net use this as a nameserver. denic.de is a domain controlled by four nameservers. All of them are on different IP networks. Incoming mail for denic.de is handled by two mailservers at denic.de themselves. They are on the same IP network. denic.de has one IP number. dns-ro.denic.de is hosted on a server in Germany.

dns-ro.denic.de
a records
 
+ 81.91.161.99 81.91.160.0/20 AS8763 -
+ --- -

denic.de
a records
 
+ 81.91.170.12 81.91.170.0/24 AS8763  
+ ---  
ns-soa records
ns1.denic.de
+ 81.91.170.1 81.91.170.0/24 AS8763 -
+ --- -
ns records
ns1.denic.de
+ 81.91.170.1 81.91.170.0/24 AS8763 -
+ --- -
ns2.denic.de
+ 193.171.255.36 193.170.0.0/15 AS1853 -
ns3.denic.de
+ 87.233.175.19 87.233.128.0/18 AS15703 -
ns4.denic.net
+ 66.35.208.43 66.35.192.0/18 AS3561 dns13.denic.de
+ --- dns13.denic.de
mx records
mx2.denic.de
+ 81.91.161.38 81.91.160.0/20 AS8763  
+ ---  
mx1.denic.de
+ 81.91.161.37 81.91.160.0/20 AS8763 -
+ --- -
ip numbers of host
81.91.161.99
ptrs of ip numbers
dns-ro.denic.de
ip numbers using ptr to this host
81.91.161.99
domains using this as nameserver
popoiu.net
ro
used as nameserver but missing in zone
popoiu.net