esdns3.mapfre.net has no CNAME records.
Question and response
Question
dig esdns3.mapfre.net. NS
Answer
The response has no answer records.
Authority
mapfre.net. 3391 SOA esdns1.mapfre.net. dnsadmin.mapfre.com. 2026022301 3600 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0