vip.cyso.com has no NS records.
NS records for this zone are defined at cyso.com.
NS records for this zone are defined at cyso.com.
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. 1772064000 16384 2048 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0