u807214.wl215.sendgrid.net has no NS records.
NS records for this zone are defined at wl215.sendgrid.net.
NS records for this zone are defined at wl215.sendgrid.net.
Question and response
Question
dig u807214.wl215.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl215.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2399778269 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0