nsplus6.2is.be has no CNAME records.
Question and response
Question
dig nsplus6.2is.be. NS
Answer
The response has no answer records.
Authority
2is.be. 3600 SOA ns03.2is.nl. domain-admin.2is.nl. 2026030501 3600 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0