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mailer.esmas.net has one IP number. esmas.net is a domain controlled by two nameservers at esmas.com. They are on the same IP network. Incoming mail for esmas.net is handled by four mailservers. All of them are on the same IP network. esmas.net has one IP number. mailer.esmas.net is hosted on a server in Mexico.

mailer.esmas.net
a records
 
+ 200.57.75.4 200.57.64.0/20 AS13591  
+ ---  

esmas.net
a records
 
+ 63.99.211.100 63.99.192.0/18 AS11486  
+ ---  
ns-soa records
sdn01.esmas.com
+ 63.99.211.253 63.99.192.0/18 AS11486 -
+ --- -
ns records
sdn01.esmas.com
+ 63.99.211.253 63.99.192.0/18 AS11486 -
+ --- -
sdn02.esmas.com
+ 63.99.211.252 63.99.192.0/18 AS11486 -
mx records
esmas.net.s7a1.psmtp.com
+ 64.18.6.14 64.18.6.0/24 AS26910 s7a1.psmtp.com
+ --- s7a1.psmtp.com
esmas.net.s7a2.psmtp.com
+ 64.18.6.13 64.18.6.0/24 AS26910 s7a2.psmtp.com
+ --- s7a2.psmtp.com
esmas.net.s7b1.psmtp.com
+ 64.18.6.11 64.18.6.0/24 AS26910 s7b1.psmtp.com
+ --- s7b1.psmtp.com
esmas.net.s7b2.psmtp.com
+ 64.18.6.10 64.18.6.0/24 AS26910 s7b2.psmtp.com
+ --- s7b2.psmtp.com
ip numbers of host
200.57.75.4