itmg.sunplusit.com has no CNAME records.
Question and response
Question
dig itmg.sunplusit.com. NS
Answer
The response has no answer records.
Authority
sunplusit.com. 2749 SOA dns.sunplusit.com. admin.sunplusit.com. 2026021011 7200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0