_spf02.mykronos.com has no NS records.
NS records for this zone are defined at mykronos.com.
NS records for this zone are defined at mykronos.com.
Question and response
Question
dig _spf02.mykronos.com. NS
Answer
The response has no answer records.
Authority
mykronos.com. 300 SOA ns-cloud-c1.googledomains.com. cloud-dns-hostmaster.google.com. 1 21600 3600 259200 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0