u22874058.wl059.sendgrid.net has no NS records.
NS records for this zone are defined at wl059.sendgrid.net.
NS records for this zone are defined at wl059.sendgrid.net.
Question and response
Question
dig u22874058.wl059.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl059.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2398974918 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0