server-2.sunucun.com.tr has no CNAME records.
Question and response
Question
dig server-2.sunucun.com.tr. NS
Answer
The response has no answer records.
Authority
sunucun.com.tr. 296 SOA gemma.ns.cloudflare.com. dns.cloudflare.com. 2396450119 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0