spf.freshbooks.com has no NS records.
NS records for this zone are defined at freshbooks.com.
NS records for this zone are defined at freshbooks.com.
Question and response
Question
dig spf.freshbooks.com. NS
Answer
The response has no answer records.
Authority
freshbooks.com. 60 SOA ns-cloud-c1.googledomains.com. sysadmin.freshbooks.com. 1 21600 3600 259200 60
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0