go
mail.calclosets.com has one IP number. corpmail.calclosets.com cnames to this hostname. znet.calclosets.com point to the same IP. calclosets.com is delegated to two nameservers, however both delegated nameservers are missing in the zone. All nameservers are at calclosets.com themselves. They are on different IP networks. mail.calclosets.com is hosted on a server in United States.

mail.calclosets.com
a records
 
+ 140.239.139.155 140.239.0.0/16 AS2828  
+ ---  

calclosets.com
ns records
ns1.calclosets.com
+ 140.239.139.156 140.239.0.0/16 AS2828  
+ ---  
ns2.calclosets.com
+ 67.88.243.163 67.88.0.0/13 AS2828  
ip numbers of host
140.239.139.155
ip numbers using ptr to this host
12.172.191.53
67.130.137.13
hostnames sharing ip with a-records
znet.calclosets.com
hostnames pointing here by cname
corpmail.calclosets.com
nameservers missing in zone
ns1.calclosets.com
ns2.calclosets.com