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mail.unitedllc.net has one IP number , but the reverse is unitedllc.net. unitedllc.net is a domain controlled by two nameservers at domaincontrol.com. They are on different IP networks. Incoming mail for unitedllc.net is handled by two mailservers at secureserver.net. They are on different IP networks. unitedllc.net has one IP number. mail.unitedllc.net is hosted on a server in United States.

mail.unitedllc.net
a records
 
+ 72.158.119.162 72.158.96.0/19 AS6389 unitedllc.net
+ --- unitedllc.net

unitedllc.net
a records
 
+ 208.109.181.17 208.109.128.0/17 AS26496  
+ ---  
ns-soa records
ns51.domaincontrol.com
+ 216.69.185.26 216.69.185.0/24 AS26496 -
+ --- -
ns records
ns51.domaincontrol.com
+ 216.69.185.26 216.69.185.0/24 AS26496 -
+ --- -
ns52.domaincontrol.com
+ 208.109.255.26 208.109.255.0/24 AS26496 -
mx records
mailstore1.secureserver.net
+ 216.69.186.201 216.69.184.0/22 AS26496 m1pismtp01-v01.prod.mesa1.secureserver.net
+ --- m1pismtp01-v01.prod.mesa1.secureserver.net
smtp.secureserver.net
+   AS?  
+ ---  
ip numbers of host
72.158.119.162
ptrs of ip numbers
unitedllc.net