dns1.ote.gr has no CNAME records.
Question and response
Question
dig dns1.ote.gr. NS
Answer
The response has no answer records.
Authority
ote.gr. 4018 SOA dns.ote.gr. root.dns.ote.gr. 2026021701 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0