mx-ll-110.164.157-70.3bb.co.th has no CNAME records.
Question and response
Question
dig mx-ll-110.164.157-70.3bb.co.th. NS
Answer
The response has no answer records.
Authority
3bb.co.th. 73 SOA ns1.3bb.co.th. hostmaster.3bb.co.th. 2026021801 10800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0