spf.planisys.net has no NS records.
NS records for this zone are defined at planisys.net.
NS records for this zone are defined at planisys.net.
Question and response
Question
dig spf.planisys.net. NS
Answer
The response has no answer records.
Authority
planisys.net. 60 SOA dns1.planisys.net. admin.planisys.net. 2021084988 3600 600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0