spf.sqr.nl has no NS records.
NS records for this zone are defined at sqr.nl.
NS records for this zone are defined at sqr.nl.
Question and response
Question
dig spf.sqr.nl. NS
Answer
The response has no answer records.
Authority
sqr.nl. 300 SOA ns1.cyso.nl. dnsadmin.cysonet.com. 1773408532 16384 2048 1209600 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0