bb001.bbtec.net has no CNAME records.
Question and response
Question
dig bb001.bbtec.net. NS
Answer
The response has no answer records.
Authority
bbtec.net. 5341 SOA bb001.bbtec.net. noc.bbtec.net. 2026021901 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0