spf1.formassembly.com has no NS records.
NS records for this zone are defined at formassembly.com.
NS records for this zone are defined at formassembly.com.
Question and response
Question
dig spf1.formassembly.com. NS
Answer
The response has no answer records.
Authority
formassembly.com. 900 SOA ns-6.awsdns-00.com. awsdns-hostmaster.amazon.com. 201801091 7200 900 1209600 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0