ns2.dcner.tr has no CNAME records.
Question and response
Question
dig ns2.dcner.tr. NS
Answer
The response has no answer records.
Authority
tr. 891 SOA ns73.ns.tr. hostmaster.trabis.gov.tr. 1771949688 7200 900 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0