cdhdf.inex.net.mx has no CNAME records.
Question and response
Question
dig cdhdf.inex.net.mx. NS
Answer
The response has no answer records.
Authority
net.mx. 1057 SOA m.mx-ns.mx. hostmaster.nic.mx. 1773011796 900 900 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0