go
mx1.effcu.org.gslb.pphosted.com has one IP number. mx2.effcu.org.gslb.pphosted.com point to the same IP. effcu.org and ipccu.com use this as a mailserver. effcu.org.gslb.pphosted.com is a domain controlled by three nameservers at proofpoint.com. All of them are on different IP networks. mx1.effcu.org.gslb.pphosted.com is hosted on a server in United States.

mx1.effcu.org.gslb.pphosted.com
a records
 
+ 67.231.144.36 67.231.144.0/24 AS26211  
+ ---  

effcu.org.gslb.pphosted.com
ns-soa records
ns-sc4.proofpoint.com
+ 208.84.66.50 208.84.66.0/24 AS26211 -
+ --- -
ns records
ns-ams.proofpoint.com
+ 91.209.104.39 91.209.104.0/24 AS15830 -
+ --- -
ns-sc4.proofpoint.com
+ 208.84.66.50 208.84.66.0/24 AS26211 -
ns-sfo.proofpoint.com
+ 208.84.64.139 208.84.64.0/23 AS26211 -
ip numbers of host
67.231.144.36
hostnames sharing ip with a-records
mx2.effcu.org.gslb.pphosted.com
domains using this as mailserver
effcu.org
ipccu.com
domains using this as mailserver under another name
effcu.org
ipccu.com