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mail2.whcorp.us has one IP number , which also has a corresponding reverse pointer. mail.whcorp.us and mail.whcorp.com point to the same IP. whcorp.us use this as a mailserver. whcorp.us is a domain controlled by two nameservers at worldnic.com. They are on different IP networks. Incoming mail for whcorp.us is handled by one mailserver at whcorp.us themselves. whcorp.us has one IP number. mail2.whcorp.us is hosted on a server in United States.

mail2.whcorp.us
a records
 
+ 64.243.16.83 64.240.0.0/14 AS3561 -
+ --- -

*.whcorp.us
a records
 
+ 205.178.189.131 205.178.160.0/19 AS6245  
+ ---  

whcorp.us
a records
 
+ 205.178.189.131 205.178.160.0/19 AS6245  
+ ---  
ns records
ns11.worldnic.com
+ 205.178.190.6 205.178.160.0/19 AS6245 -
+ --- -
ns12.worldnic.com
+ 205.178.144.6 205.178.144.0/24 AS19871 -
mx records
mail2.whcorp.us
+ 64.243.16.83 64.240.0.0/14 AS3561 -
+ --- -
ip numbers of host
64.243.16.83
ptrs of ip numbers
mail2.whcorp.us
ip numbers using ptr to this host
64.243.16.83
hostnames sharing ip with a-records
mail.whcorp.com
mail.whcorp.us
domains using this as mailserver
whcorp.us
domains using this as mailserver under another name
whcorp.com