u2342293.wl044.sendgrid.net has no NS records.
NS records for this zone are defined at wl044.sendgrid.net.
NS records for this zone are defined at wl044.sendgrid.net.
Question and response
Question
dig u2342293.wl044.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl044.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2399093818 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0