ygg1.vp.vc has no NS records.
NS records for this zone are defined at vp.vc.
NS records for this zone are defined at vp.vc.
Question and response
Question
dig ygg1.vp.vc. NS
Answer
The response has no answer records.
Authority
vp.vc. 180 SOA ns11.constellix.com. dns.constellix.com. 2015011549 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0