alt1.cloudcone.mx has no CNAME records.
Question and response
Question
dig alt1.cloudcone.mx. NS
Answer
The response has no answer records.
Authority
cloudcone.mx. 3600 SOA ac1.cloudcone.net. admin.cloudcone.com. 2023121302 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0