vcenter.dcnet.tr has no CNAME records.
Question and response
Question
dig vcenter.dcnet.tr. NS
Answer
The response has no answer records.
Authority
dcnet.tr. 2013 SOA akyuz.dcnet.tr. hostmaster.dcnet.tr. 2026021001 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0