owncloud-ext.kcnet.org has no CNAME records.
Question and response
Question
dig owncloud-ext.kcnet.org. NS
Answer
The response has no answer records.
Authority
kcnet.org. 300 SOA kcns1.kcnet.org. kcadmin.kcnet.org. 2018111801 3600 900 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0