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mail45.mobile.de has one IP number , but the reverse is mail45-1.mobile.de. mail.mobile.de, mail41.mobile.de, mail42.mobile.de and mail45-1.mobile.de point to the same IP. mobile.eu, mobile.es, mobile.ro, mobile.ch, motorspro.se and at least twelve other hosts use this as a mailserver. 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. mail45.mobile.de is hosted on a server in Germany.

mail45.mobile.de
a records
 
+ 194.50.68.1 194.50.68.0/24 AS29454 mail45-1.mobile.de
+ --- mail45-1.mobile.de

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
194.50.68.1
ptrs of ip numbers
mail45-1.mobile.de
hostnames sharing ip with a-records
mail.mobile.de
mail41.mobile.de
mail42.mobile.de
mail45-1.mobile.de
domains using this as mailserver
ebay-auto-pro.com
ebay-automobile.fr
ebay-automobile.it
ebayautopro.com
ebayautopro.fr
ebaymotoripro.it
ebaymotorspro.at
ebaymotorspro.co.uk
ebaymotorspro.de
ebaymotorspro.fr
ebaymotorspro.it
ebaymotorspro.se
mobile.ch
mobile.es
mobile.eu
mobile.ro
motorspro.se
domains using this as mailserver under another name
altorf.com
auto-channel.com
auto-simon.com
auto-stern.com
autohaus-braun.com
autohaus-elbgemeinden.com
autohaus-weissenfels.com
autohaus2000.net
automarkt-darmstadt.com
automeier.com
automobile-fischer.com
bedarf.com
bilgin-automobile.net
bollnow.com
business-car.net
citymobile.net
fischer-autohaus.net
hd-porta.de
honda-nix.de
live-car.net
lueschen.com
mobile.de
mobilede.com
muhr-gmbh.com
mw-automobile.com
ops.mobile.de
pappler.com
pw-automobile.com
reca-automobile.com
traffic-service.net
truckandtrailors.com
vertragshaendler.com
voebel.com