doctest.ia.surf.nl has no NS records.
NS records for this zone are defined at ia.surf.nl.
NS records for this zone are defined at ia.surf.nl.
Question and response
Question
dig doctest.ia.surf.nl. NS
Answer
The response has no answer records.
Authority
ia.surf.nl. 3600 SOA ns1.surfnet.nl. hostmaster.surfnet.nl. 2603251200 7200 600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0