u17769561.wl062.sendgrid.net has no NS records.
NS records for this zone are defined at wl062.sendgrid.net.
NS records for this zone are defined at wl062.sendgrid.net.
Question and response
Question
dig u17769561.wl062.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl062.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2398906163 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0