ns2.ispio.com has no CNAME records.
Question and response
Question
dig ns2.ispio.com. NS
Answer
The response has no answer records.
Authority
ispio.com. 3480 SOA ns1.nipa.co.th. noc.ispio.com. 2025022502 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0