vip.cyso.com has no CNAME records.
Question and response
Question
dig vip.cyso.com. NS
Answer
The response has no answer records.
Authority
cyso.com. 2560 SOA ns1.cyso.nl. dnsadmin.cysonet.com. 1771459200 16384 2048 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0