ns30.suthost.com has no CNAME records.
Question and response
Question
dig ns30.suthost.com. NS
Answer
The response has no answer records.
Authority
suthost.com. 31 SOA ns7.alidns.com. hostmaster.hichina.com. 2026011209 3600 1200 86400 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0