u45748059.wl060.sendgrid.net has no NS records.
NS records for this zone are defined at wl060.sendgrid.net.
NS records for this zone are defined at wl060.sendgrid.net.
Question and response
Question
dig u45748059.wl060.sendgrid.net. NS
Answer
The response has no answer records.
Authority
wl060.sendgrid.net. 1800 SOA aisha.ns.cloudflare.com. dns.cloudflare.com. 2399678547 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0