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se.mobile.de has one IP number , via cname to www.mobile.de , which also has a corresponding reverse pointer. mobile.de and mobile.ch point to the same IP. 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. se.mobile.de is hosted on a server in Germany.

se.mobile.de
cname records
www.mobile.de
+ 194.50.69.90 194.50.69.0/24 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 www.mobile.de
+ --- www.mobile.de
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 mail46-2.mobile.de
+ --- mail46-2.mobile.de
mail45-1.mobile.de
+ 194.50.68.1 194.50.68.0/24 AS29454 -
+ --- -
ip numbers of host
194.50.69.90
ptrs of ip numbers
www.mobile.de
hostnames sharing ip with a-records
mobile.ch
mobile.de
cname
www.mobile.de