go
maka.csnet.es has one IP number , which also has a corresponding reverse pointer. csnet.es is a domain controlled by three nameservers at csnet.es themselves. All of them are on different IP networks. Incoming mail for csnet.es is handled by three mailservers also at csnet.es. Two of them are on the same IP network. csnet.es has one IP number , but the reverse is sofia.csnet.es. maka.csnet.es is hosted on a server in Spain.

maka.csnet.es
a records
 
+ 213.171.248.53 213.171.224.0/19 AS16206 -
+ --- -

csnet.es
a records
 
+ 213.171.248.51 213.171.224.0/19 AS16206 sofia.csnet.es
+ --- sofia.csnet.es
ns-soa records
dns1.csnet.es
+ 213.171.248.50 213.171.224.0/19 AS16206 caronte.csnet.es
+ --- caronte.csnet.es
ns records
dns1.csnet.es
+ 213.171.248.50 213.171.224.0/19 AS16206 caronte.csnet.es
+ --- caronte.csnet.es
dns2.csnet.es
+ 80.24.136.56 80.24.0.0/16 AS3352 56.red-80-24-136.staticip.rima-tde.net
+ --- 56.red-80-24-136.staticip.rima-tde.net
dns3.csnet.es
+ 91.121.171.152 91.121.0.0/16 AS16276  
+ ---  
mx records
mail0.csnet.es
+ 213.171.248.51 213.171.224.0/19 AS16206 sofia.csnet.es
+ --- sofia.csnet.es
mail1.csnet.es
+ 80.24.136.56 80.24.0.0/16 AS3352 56.red-80-24-136.staticip.rima-tde.net
+ --- 56.red-80-24-136.staticip.rima-tde.net
mail2.csnet.es
+ 213.171.248.54 213.171.224.0/19 AS16206 wilma.csnet.es
+ --- wilma.csnet.es
ip numbers of host
213.171.248.53
ptrs of ip numbers
maka.csnet.es
ip numbers using ptr to this host
213.171.248.53