NS2.sharktech.net has no CNAME records.
Question and response
Question
dig NS2.sharktech.net. NS
Answer
The response has no answer records.
Authority
sharktech.net. 2171 SOA ns1.sharktech.net. admin.sharktech.net. 2022080902 300 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0