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mail.pantec.com has one IP number. pantec.com is a domain controlled by two nameservers on the same IP network. Incoming mail for pantec.com is handled by two mailservers at pantec.com themselves. They are on the same IP network. mail.pantec.com is hosted on a server in Liechtenstein.

mail.pantec.com
a records
 
+ 82.117.6.75 82.117.0.0/19 AS35223  
+ ---  

pantec.com
ns records
dns1.abila.li
+ 82.117.0.66 82.117.0.0/19 AS35223 -
+ --- -
mars.newsnet.li
+ 82.117.0.72 82.117.0.0/19 AS35223 -
mx records
mailq.pantec.com
+ 82.117.2.243 82.117.0.0/19 AS35223  
+ ---  
mailer.pantec.com
+ 82.117.6.74 82.117.0.0/19 AS35223 -
+ --- -
ip numbers of host
82.117.6.75
ip numbers using ptr to this host
80.248.198.134