dns.linuxpl.com has no CNAME records.
Question and response
Question
dig dns.linuxpl.com. NS
Answer
The response has no answer records.
Authority
linuxpl.com. 231 SOA dns10.linuxpl.com. root.linuxpl.com. 2024121700 300 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0