m.lessonly.com has no NS records.
NS records for this zone are defined at lessonly.com.
NS records for this zone are defined at lessonly.com.
Question and response
Question
dig u246655.wl156.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl156.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2397387736 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0