grid01.geant.net has no NS records.
NS records for this zone are defined at geant.net.
NS records for this zone are defined at geant.net.
Question and response
Question
dig grid01.geant.net. NS
Answer
The response has no answer records.
Authority
geant.net. 900 SOA grid01.geant.net. hostmaster.dante.net. 2015081010 3600 7200 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0