sad.plasticudyog.com has no CNAME records.
Question and response
Question
dig sad.plasticudyog.com. NS
Answer
The response has no answer records.
Authority
plasticudyog.com. 10522 SOA ns1.dyna-ns.net. hostmaster.plasticudyog.com. 2026030601 16384 2048 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0