cloud.o-net.com.ua has no CNAME records.
Question and response
Question
dig cloud.o-net.com.ua. NS
Answer
The response has no answer records.
Authority
o-net.com.ua. 774 SOA ns19.o-net.com.ua. hostmaster.o-net.com.ua. 2025033003 600 1800 3600000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0