rs7141.alegeus.com has no CNAME records.
Question and response
Question
dig rs7141.alegeus.com. NS
Answer
The response has no answer records.
Authority
alegeus.com. 1074 SOA coby.ns.cloudflare.com. dns.cloudflare.com. 2397626479 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0