u18582349.wl100.sendgrid.net has no NS records.
NS records for this zone are defined at wl100.sendgrid.net.
NS records for this zone are defined at wl100.sendgrid.net.
Question and response
Question
dig u18582349.wl100.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl100.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2399355713 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0