dns1.cibonet.com has no CNAME records.
Question and response
Question
dig dns1.cibonet.com. NS
Answer
The response has no answer records.
Authority
cibonet.com. 299 SOA dns1.cibonet.com. benfeng.cibonet.com. 2018122401 10800 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0