cloud-2123.masterinter.net has no CNAME records.
Question and response
Question
dig cloud-2123.masterinter.net. NS
Answer
The response has no answer records.
Authority
masterinter.net. 262 SOA ns1.master.cz. noc.master.cz. 2026032545 900 900 1800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0