_hspf2.hubspot.com has no CNAME records.
Question and response
Question
dig _hspf2.hubspot.com. NS
Answer
The response has no answer records.
Authority
hubspot.com. 318 SOA jerry.ns.cloudflare.com. dns.cloudflare.com. 2398262027 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0