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Sorry, we have no information about zaragoza-gw.cdc.es. cdc.es is a domain controlled by two nameservers at interferr.com. They are on the same IP network. Incoming mail for cdc.es is handled by one mailserver at cdc.es themselves. cdc.es has one IP number.

cdc.es
a records
 
+ 82.223.142.41 82.223.0.0/16 AS20718  
+ ---  
ns-soa records
ns1.interferr.com
+ 82.223.142.33 82.223.0.0/16 AS20718 33.142.223.82.arsystel.com
+ --- 33.142.223.82.arsystel.com
ns records
ns1.interferr.com
+ 82.223.142.33 82.223.0.0/16 AS20718 33.142.223.82.arsystel.com
+ --- 33.142.223.82.arsystel.com
ns2.interferr.com
+ 82.223.142.34 82.223.0.0/16 AS20718 34.142.223.82.arsystel.com
+ --- 34.142.223.82.arsystel.com
mx records
mx.cdc.es
+ 80.34.83.45 80.34.0.0/16 AS3352 45.red-80-34-83.staticip.rima-tde.net
+ --- 45.red-80-34-83.staticip.rima-tde.net