zabbix.boostnet.com.mx has no CNAME records.
Question and response
Question
dig zabbix.boostnet.com.mx. NS
Answer
The response has no answer records.
Authority
boostnet.com.mx. 1610 SOA ns1.boostnet.com.mx. admin.boostnet.com.mx. 2025051201 3600 1800 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0