u161779.wl030.sendgrid.net has no NS records.
NS records for this zone are defined at wl030.sendgrid.net.
NS records for this zone are defined at wl030.sendgrid.net.
Question and response
Question
dig u161779.wl030.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl030.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2399223914 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0