cache.test-cdn.gblnet.ru has no CNAME records.
Question and response
Question
dig cache.test-cdn.gblnet.ru. NS
Answer
The response has no answer records.
Authority
test-cdn.gblnet.ru. 3600 SOA ns.gblnet.ru. vvv.gblnet.ru. 2025103101 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0