u43932578.wl079.sendgrid.net has no NS records.
NS records for this zone are defined at wl079.sendgrid.net.
NS records for this zone are defined at wl079.sendgrid.net.
Question and response
Question
dig u43932578.wl079.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl079.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2399223502 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0