web11.serenisys.com has no CNAME records.
Question and response
Question
dig web11.serenisys.com. NS
Answer
The response has no answer records.
Authority
serenisys.com. 824 SOA ns1.galaxie.cloud. hostmaster.serenisys.com. 2025101500 14400 3600 1209600 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0