spf2.successfactors.com has no NS records.
NS records for this zone are defined at successfactors.com.
NS records for this zone are defined at successfactors.com.
Question and response
Question
dig spf2.successfactors.com. NS
Answer
The response has no answer records.
Authority
successfactors.com. 3600 SOA ns1.sap.net. dns.sap-ag.de. 1773060396 3578 3600 2592000 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0