rdnx-60.121.45.ispio.com has no CNAME records.
Question and response
Question
dig rdnx-60.121.45.ispio.com. NS
Answer
The response has no answer records.
Authority
ispio.com. 3600 SOA ns1.nipa.co.th. noc.ispio.com. 2025022502 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0