support.host-telecom.com has no CNAME records.
Question and response
Question
dig support.host-telecom.com. NS
Answer
The response has no answer records.
Authority
host-telecom.com. 539 SOA alpha.host-telecom.com. noc.host-telecom.com. 2025112301 28800 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0