go
sorter.nic.mil has one IP number , which also has a corresponding reverse pointer. nic.mil use this as a mailserver. nic.mil is a domain controlled by three nameservers at nipr.mil. All of them are on different IP networks. Incoming mail for nic.mil is handled by one mailserver at nic.mil themselves. nic.mil has one IP number. sorter.nic.mil is hosted on a server in United States.

sorter.nic.mil
a records
 
+ 207.132.116.8 207.132.64.0/18 AS27064 -
+ --- -

nic.mil
a records
 
+ 207.132.116.20 207.132.64.0/18 AS27064  
+ ---  
ns-soa records
con1.nipr.mil
+ 199.252.157.234 199.252.157.0/24 AS5927 -
+ --- -
ns records
con1.nipr.mil
+ 199.252.157.234 199.252.157.0/24 AS5927 -
+ --- -
eur1.nipr.mil
+ 199.252.154.234 199.252.154.0/24 AS5927 -
pac1.nipr.mil
+ 199.252.180.234 199.252.180.0/24 AS5927 -
mx records
sorter.nic.mil
+ 207.132.116.8 207.132.64.0/18 AS27064 -
+ --- -
ip numbers of host
207.132.116.8
ptrs of ip numbers
sorter.nic.mil
ip numbers using ptr to this host
207.132.116.8
domains using this as mailserver
nic.mil