ns4.blackcloudhost.com has no CNAME records.
Question and response
Question
dig ns4.blackcloudhost.com. NS
Answer
The response has no answer records.
Authority
blackcloudhost.com. 784 SOA ns1.enginelogin.com. r\.melo.quarsec.com. 2026010601 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0