_spf2-sfdc.sapsf.com has no NS records.
NS records for this zone are defined at sapsf.com.
NS records for this zone are defined at sapsf.com.
Question and response
Question
dig _spf2-sfdc.sapsf.com. NS
Answer
The response has no answer records.
Authority
sapsf.com. 300 SOA ns1.sap.net. dns.sap-ag.de. 2019077556 3511 1800 1814400 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0