sms.o4s.nl has no NS records.
NS records for this zone are defined at o4s.nl.
NS records for this zone are defined at o4s.nl.
Question and response
Question
dig sms.o4s.nl. NS
Answer
The response has no answer records.
Authority
o4s.nl. 3600 SOA nsauth1.pinkzuid.nl. hostmaster.pinkzuid.nl. 2024050103 28800 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0