dns3.bigpond.com.kh has no CNAME records.
Question and response
Question
dig dns3.bigpond.com.kh. NS
Answer
The response has no answer records.
Authority
bigpond.com.kh. 10800 SOA dns1.online.com.kh. hostmaster.online.com.kh. 2022030701 14400 3600 691200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0