host5.corese.com has no CNAME records.
Question and response
Question
dig host5.corese.com. NS
Answer
The response has no answer records.
Authority
corese.com. 10569 SOA ns1.clook.net. sys-admin.uk-noc.com. 2026012700 14400 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0