go
in-addr.arpa.hostmar.com are subdomains to this hostname. hostmar.com is a domain controlled by two nameservers at hostmar.com themselves. They are on the same IP network. Incoming mail for hostmar.com is handled by one mailserver at com. hostmar.com has one IP number , but the reverse is elmejor.elmejorcafe.com.ar.

hostmar.com
a records
 
+ 200.58.112.9 200.58.112.0/24 AS27823 elmejor.elmejorcafe.com.ar
+ --- elmejor.elmejorcafe.com.ar
ns-soa records
ns1.hostmar.com
+ 200.58.112.193 200.58.112.0/24 AS27823 ns3.hostmar.com
+ --- ns3.hostmar.com
ns records
ns1.hostmar.com
+ 200.58.112.193 200.58.112.0/24 AS27823 ns3.hostmar.com
+ --- ns3.hostmar.com
ns2.hostmar.com
+ 200.58.112.101 200.58.112.0/24 AS27823 ns4.hostmar.com
+ --- ns4.hostmar.com
mx records
hostmar.com
+ 200.58.112.9 200.58.112.0/24 AS27823 elmejor.elmejorcafe.com.ar
+ --- elmejor.elmejorcafe.com.ar
subdomains
in-addr.arpa.hostmar.com