ns1.server.net has no CNAME records.
Question and response
Question
dig ns1.server.net. NS
Answer
The response has no answer records.
Authority
server.net. 10546 SOA ns1.servernet.net. ae.bulut.net. 2026012800 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0