go
mxi01.mxrc.co.za has one IP number , which also has a corresponding reverse pointer. mx01.mxrc.co.za and mxc02.stonewall.co.za point to the same IP. tyco.co.za, intec24.com and tycotrucks.co.za use this as a mailserver. mxrc.co.za is a domain controlled by three nameservers at is.co.za. All of them are on different IP networks. Incoming mail for mxrc.co.za is handled by one mailserver having a total of two IP numbers. They are on different IP networks. mxi01.mxrc.co.za is hosted on a server in South Africa.

mxi01.mxrc.co.za
a records
 
+ 196.35.198.130 196.34.0.0/15 AS3741 -
+ --- -

mxrc.co.za
ns-soa records
 
+   AS?  
+ ---  
ns records
demeter.is.co.za
+ 196.26.5.8 196.26.5.0/24 AS3741 -
+ --- -
jupiter.is.co.za
+ 196.4.160.3 196.4.160.0/24 AS3741 -
titan.is.co.za
+ 196.33.171.36 196.33.0.0/16 AS3741 -
mx records
internal-relay.is.co.za
+ 196.4.160.171 196.4.160.0/24 AS3741 phobytor.is.co.za
+ --- phobytor.is.co.za
+ 196.35.45.229 196.34.0.0/15 AS3741 morpheus.is.co.za
+ --- morpheus.is.co.za
ip numbers of host
196.35.198.130
ptrs of ip numbers
mxi01.mxrc.co.za
ip numbers using ptr to this host
196.35.198.130
hostnames sharing ip with a-records
mx01.mxrc.co.za
mxc02.stonewall.co.za
domains using this as mailserver
intec24.com
tyco.co.za
tycotrucks.co.za
domains using this as mailserver under another name
mx01.mxrc.co.za
stonewall.co.za