ftth.saitis.net has no CNAME records.
Question and response
Question
dig ftth.saitis.net. NS
Answer
The response has no answer records.
Authority
saitis.net. 7174 SOA ns1.saitis.net. tech-dns.nimag.net. 2026020903 31800 1800 604800 31800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0