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Sorry, we have no information about content.mobile.de. 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 one mailserver also at mobile.de. mobile.de has two IP numbers. They are on different IP networks.

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.mobile.de
+ 194.50.69.1 194.50.69.0/24 AS29454 -
+ --- -
ip numbers using ptr to this host
194.50.68.66
194.50.69.66