pgg18a.bf01x.hubspotemail.net has no NS records.
NS records for this zone are defined at hubspotemail.net.
NS records for this zone are defined at hubspotemail.net.
Question and response
Question
dig pgg18a.bf01x.hubspotemail.net. NS
Answer
The response has no answer records.
Authority
hubspotemail.net. 1800 SOA jerry.ns.cloudflare.com. dns.cloudflare.com. 2400147144 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0