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admin.mobile.de has two IP numbers. They are on different IP networks. www.admin.mobile.de cnames to this hostname. admin2.mobile.de point to the same IP. www.admin.mobile.de are subdomains to this hostname. mobile.de is a domain controlled by two nameservers at mobile.de themselves. They are on different IP networks. Incoming mail for mobile.de is handled by two mailservers also at mobile.de. They are on different IP networks. mobile.de has two IP numbers. They are on different IP networks. admin.mobile.de is hosted on two servers in Germany.

admin.mobile.de
a records
 
+ 194.50.68.91 194.50.68.0/24 AS29454 -
+ --- -
+ 194.50.69.91 194.50.69.0/24 AS29454 -

mobile.de
a records
 
+ 194.50.68.90 194.50.68.0/24 AS29454  
+ ---  
+ 194.50.69.90 194.50.69.0/24 AS29454  
ns-soa records
dns45-2.mobile.de
+ 194.50.68.18 194.50.68.0/24 AS29454 -
+ --- -
ns records
dns45-2.mobile.de
+ 194.50.68.18 194.50.68.0/24 AS29454 -
+ --- -
dns46-2.mobile.de
+ 194.50.69.18 194.50.69.0/24 AS29454 -
mx records
mail46-1.mobile.de
+ 194.50.69.2 194.50.69.0/24 AS29454 -
+ --- -
mail45-1.mobile.de
+ 194.50.68.1 194.50.68.0/24 AS29454 -
ip numbers of host
194.50.68.91
194.50.69.91
ptrs of ip numbers
admin.mobile.de
ip numbers using ptr to this host
194.50.68.91
194.50.69.91
hostnames sharing ip with a-records
admin2.mobile.de
hostnames pointing here by cname
www.admin.mobile.de
subdomains
www.admin.mobile.de