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prodmx1.usaa.com has one IP number , which also has a corresponding reverse pointer. usaa.com use this as a mailserver. usaa.com is a domain controlled by three nameservers at usaa.com themselves. All of them are on different IP networks. Incoming mail for usaa.com is handled by two mailservers also at usaa.com. They are on different IP networks. usaa.com has two IP numbers. They are on different IP networks. prodmx1.usaa.com is hosted on a server in United States.

prodmx1.usaa.com
a records
 
+ 167.24.101.202 167.24.101.0/24 AS7838 -
+ --- -

usaa.com
a records
 
+ 167.24.21.4 167.24.21.0/24 AS7838  
+ ---  
+ 167.24.111.4 167.24.111.0/24 AS7838  
ns-soa records
usaa.com
+ 167.24.21.4 167.24.21.0/24 AS7838  
+ ---  
+ 167.24.111.4 167.24.111.0/24 AS7838  
ns records
usaans1.usaa.com
+ 167.24.101.118 167.24.101.0/24 AS7838 -
+ --- -
usaans2.usaa.com
+ 167.24.27.100 167.24.27.0/24 AS7838 -
usaans3.usaa.com
+ 167.24.120.79 167.24.120.0/24 AS7838 -
mx records
prodmx1.usaa.com
+ 167.24.101.202 167.24.101.0/24 AS7838 -
+ --- -
prodmx2.usaa.com
+ 167.24.25.91 167.24.25.0/24 AS7838 -
ip numbers of host
167.24.101.202
ptrs of ip numbers
prodmx1.usaa.com
ip numbers using ptr to this host
167.24.101.202
domains using this as mailserver
usaa.com