rbx115b.superfasthost.cloud has no CNAME records.
Question and response
Question
dig rbx115b.superfasthost.cloud. NS
Answer
The response has no answer records.
Authority
superfasthost.cloud. 1030 SOA amanda.ns.cloudflare.com. dns.cloudflare.com. 2395035379 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0