u6284503.wl004.sendgrid.net has no NS records.
NS records for this zone are defined at wl004.sendgrid.net.
NS records for this zone are defined at wl004.sendgrid.net.
Question and response
Question
dig u6284503.wl004.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl004.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2399000071 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0