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ns.geomar.pl has one IP number , which also has a corresponding reverse pointer. mail.geomar.pl and mail.geomar.com.pl point to the same IP. geomar.pl is a domain controlled by two nameservers at myinet.pl. They are on the same IP network. Incoming mail for geomar.pl is handled by one mailserver at geomar.pl themselves. geomar.pl has one IP number. ns.geomar.pl is hosted on a server in Poland.

ns.geomar.pl
a records
 
+ 212.14.58.157 212.14.48.0/20 AS13119 -
+ --- -

geomar.pl
a records
 
+ 80.72.194.199 80.72.192.0/20 AS21068  
+ ---  
ns-soa records
dns.myinet.pl
+ 80.72.194.130 80.72.192.0/20 AS21068 myinet.pl
+ --- myinet.pl
+ --- dns3.inet.pl
+ --- -
ns records
dns.myinet.pl
+ 80.72.194.130 80.72.192.0/20 AS21068 myinet.pl
+ --- myinet.pl
+ --- dns3.inet.pl
+ --- -
dns2.myinet.pl
+ 80.72.194.135 80.72.192.0/20 AS21068 dns4.inet.pl
+ --- dns4.inet.pl
+ --- ftp.myinet.pl
+ --- -
mx records
mail.geomar.pl
+ 212.14.58.157 212.14.48.0/20 AS13119 ns.geomar.pl
+ --- ns.geomar.pl
ip numbers of host
212.14.58.157
ptrs of ip numbers
ns.geomar.pl
ip numbers using ptr to this host
212.14.58.157
hostnames sharing ip with a-records
mail.geomar.com.pl
mail.geomar.pl
domains using this as mailserver under another name
geomar.com.pl
geomar.pl